diff --git a/app/(auth)/login/page.tsx b/app/(auth)/login/page.tsx
index 6809ad7ad..d9bf95058 100644
--- a/app/(auth)/login/page.tsx
+++ b/app/(auth)/login/page.tsx
@@ -374,7 +374,37 @@ export default function Page() {
     };
   }, []);
 
-  // 根据组织名称启动钉钉登录（在 iframe 中打开）
+  const getSafeLoginCallbackUrl = () => {
+    if (typeof window === "undefined") return "/";
+
+    const callbackUrl = new URLSearchParams(window.location.search).get(
+      "callbackUrl",
+    );
+    if (
+      callbackUrl &&
+      callbackUrl.startsWith("/") &&
+      !callbackUrl.startsWith("//")
+    ) {
+      return callbackUrl;
+    }
+
+    return "/";
+  };
+
+  const buildDingTalkLoginUrl = (orgName?: string) => {
+    const params = new URLSearchParams();
+    if (orgName) params.set("org", orgName);
+
+    const callbackUrl = getSafeLoginCallbackUrl();
+    if (callbackUrl !== "/") {
+      params.set("callbackUrl", callbackUrl);
+    }
+
+    const query = params.toString();
+    return `/api/auth/dingtalk/login${query ? `?${query}` : ""}`;
+  };
+
+  // 根据组织名称启动钉钉登录。钉钉授权页禁止第三方 iframe 嵌入，必须使用顶层跳转。
   const startDingTalkLoginForOrg = (orgName: string) => {
     // 清除 URL 中的 token 参数，避免干扰
     if (
@@ -385,14 +415,12 @@ export default function Page() {
       window.history.replaceState({}, "", newUrl);
     }
 
-    const loginUrl = `/api/auth/dingtalk/login?org=${encodeURIComponent(
-      orgName,
-    )}`;
+    const loginUrl = buildDingTalkLoginUrl(orgName);
 
-    console.log("[DingTalk] Opening org login:", orgName, loginUrl);
-    setDingTalkIframeSrc(loginUrl);
+    console.log("[DingTalk] Redirecting org login:", orgName, loginUrl);
     setShowDingTalkModal(true);
     setShowOrgMenu(false);
+    window.location.assign(loginUrl);
   };
 
   // 钉钉登录 - 支持多组织
@@ -409,7 +437,6 @@ export default function Page() {
         return;
       }
 
-      // 兼容：直接使用旧的方式在 iframe 中打开
       if (
         typeof window === "undefined" ||
         typeof window.location === "undefined"
@@ -424,27 +451,9 @@ export default function Page() {
         window.history.replaceState({}, "", newUrl);
       }
 
-      const param = {
-        redirect_uri: encodeURIComponent(
-          window.location.origin + "/dingtalk-callback.html",
-        ),
-        client_id: dingTalkAppKey,
-        scope: "openid",
-        response_type: "code",
-        state: "default",
-        prompt: "consent",
-      };
-
-      const redirectUrl =
-        "https://login.dingtalk.com/oauth2/auth?" +
-        Object.keys(param)
-          .map((key) => key + "=" + (param as any)[key])
-          .join("&");
-
-      console.log("[DingTalk] Opening OAuth URL (legacy):", redirectUrl);
-
-      setDingTalkIframeSrc(redirectUrl);
-      setShowDingTalkModal(true);
+      const loginUrl = buildDingTalkLoginUrl();
+      console.log("[DingTalk] Redirecting OAuth login:", loginUrl);
+      window.location.assign(loginUrl);
       return;
     }
 
@@ -633,17 +642,7 @@ export default function Page() {
                     <button
                       key={org}
                       type="button"
-                      onClick={() => {
-                        const loginUrl = `/api/auth/dingtalk/login?org=${encodeURIComponent(
-                          org,
-                        )}`;
-                        console.log(
-                          "[DingTalk] Selected organization:",
-                          org,
-                          loginUrl,
-                        );
-                        setDingTalkIframeSrc(loginUrl);
-                      }}
+                      onClick={() => startDingTalkLoginForOrg(org)}
                       className="flex w-full items-center justify-between rounded-md border bg-white px-4 py-2 text-sm font-medium text-gray-700 shadow-sm hover:bg-gray-50 dark:bg-zinc-900 dark:text-zinc-200 dark:hover:bg-zinc-800"
                     >
                       <span>{org}</span>
@@ -651,7 +650,7 @@ export default function Page() {
                   ))}
                 </div>
                 <p className="text-xs text-muted-foreground">
-                  选择后将在下方加载钉钉登录页面。
+                  选择后将跳转到钉钉完成授权。
                 </p>
               </div>
             )}
diff --git a/app/api/auth/dingtalk/callback/route.ts b/app/api/auth/dingtalk/callback/route.ts
index 58c9fdbbe..85f320ea5 100644
--- a/app/api/auth/dingtalk/callback/route.ts
+++ b/app/api/auth/dingtalk/callback/route.ts
@@ -6,10 +6,52 @@ import { generateUUID } from "@/lib/utils";
 import { signIn } from "@/app/(auth)/auth";
 import { eq } from "drizzle-orm";
 
+const normalizeCallbackUrl = (value: unknown) => {
+  if (typeof value !== "string" || !value) return "/";
+
+  try {
+    const parsed = new URL(value, "https://local.invalid");
+    if (parsed.origin !== "https://local.invalid") return "/";
+    return `${parsed.pathname}${parsed.search}${parsed.hash}` || "/";
+  } catch {
+    return "/";
+  }
+};
+
+const parseDingTalkState = (state: string | null) => {
+  if (!state) {
+    return { org: undefined as string | undefined, callbackUrl: "/" };
+  }
+
+  if (state.startsWith("v1.")) {
+    try {
+      const payload = JSON.parse(
+        Buffer.from(state.slice(3), "base64url").toString("utf8"),
+      ) as { org?: unknown; callbackUrl?: unknown };
+
+      return {
+        org:
+          typeof payload.org === "string" && payload.org !== "default"
+            ? payload.org
+            : undefined,
+        callbackUrl: normalizeCallbackUrl(payload.callbackUrl),
+      };
+    } catch (error) {
+      console.warn("[DingTalk Callback] Failed to parse state payload:", error);
+    }
+  }
+
+  return {
+    org: state !== "default" ? state : undefined,
+    callbackUrl: "/",
+  };
+};
+
 export async function GET(request: NextRequest) {
   const { searchParams } = new URL(request.url);
   const code = searchParams.get("code");
   const state = searchParams.get("state");
+  const dingTalkState = parseDingTalkState(state);
 
   console.log(
     "[DingTalk Callback] Received code:",
@@ -31,8 +73,8 @@ export async function GET(request: NextRequest) {
   }
 
   const organizations = settings.dingTalkOrganizations ?? [];
-  const selectedOrg = state
-    ? organizations.find((org) => org.name === state)
+  const selectedOrg = dingTalkState.org
+    ? organizations.find((org) => org.name === dingTalkState.org)
     : organizations[0];
 
   const appKey = selectedOrg?.appKey ?? settings.dingTalkAppKey;
@@ -290,6 +332,7 @@ export async function GET(request: NextRequest) {
         departments: userInfo.departmentNames || [],
       },
       token,
+      callbackUrl: dingTalkState.callbackUrl,
     });
 
   } catch (error) {
diff --git a/app/api/auth/dingtalk/login/route.ts b/app/api/auth/dingtalk/login/route.ts
index a4f02ce3e..c9002fcd0 100644
--- a/app/api/auth/dingtalk/login/route.ts
+++ b/app/api/auth/dingtalk/login/route.ts
@@ -1,6 +1,24 @@
 import { NextResponse } from "next/server";
 import { getAuthSettings } from "@/lib/db/queries";
 
+const normalizeCallbackUrl = (value: string | null) => {
+  if (!value) return "/";
+
+  try {
+    const parsed = new URL(value, "https://local.invalid");
+    if (parsed.origin !== "https://local.invalid") return "/";
+    return `${parsed.pathname}${parsed.search}${parsed.hash}` || "/";
+  } catch {
+    return "/";
+  }
+};
+
+const encodeState = (payload: { org: string; callbackUrl: string }) => {
+  return `v1.${Buffer.from(JSON.stringify(payload), "utf8").toString(
+    "base64url",
+  )}`;
+};
+
 export async function GET(request: Request) {
   const settings = await getAuthSettings();
 
@@ -34,8 +52,11 @@ export async function GET(request: Request) {
   const baseUrl = process.env.AUTH_URL || requestUrl.origin;
   const redirectUri = `${baseUrl}/dingtalk-callback.html`;
 
-  // 使用组织名称作为 state，便于回调时选择对应的配置
-  const state = orgName || selectedOrg?.name || "default";
+  // state 中保存组织和登录后的回跳地址，回调接口仍兼容旧的纯组织名 state。
+  const state = encodeState({
+    org: orgName || selectedOrg?.name || "default",
+    callbackUrl: normalizeCallbackUrl(urlObj.searchParams.get("callbackUrl")),
+  });
 
   // 钉钉 OAuth 2.0 授权地址
   const url =
diff --git a/lib/ai/providers/openai-image.ts b/lib/ai/providers/openai-image.ts
index 868e633f3..c5c3eff89 100644
--- a/lib/ai/providers/openai-image.ts
+++ b/lib/ai/providers/openai-image.ts
@@ -26,6 +26,7 @@ interface UploadedImage {
 const DEFAULT_IMAGE_SIZE = "2K";
 const DEFAULT_TIMEOUT_MS = 300000;
 const OPENAI_IMAGE_MIN_TOTAL_PIXELS = 3_686_400;
+const OPENAI_IMAGE_DIMENSION_MULTIPLE = 16;
 const BLTCY_HOST_REGEX = /(^|\.)bltcy\.ai$/i;
 const KONTEXT_MODEL_REGEX = /kontext/i;
 const SUPPORTED_ASPECT_RATIOS = [
@@ -83,16 +84,32 @@ function normalizeAspectRatio(value?: string) {
   return undefined;
 }
 
-function parseAspectRatioValue(ratio: string) {
+function parseAspectRatioPair(ratio: string) {
   const [width, height] = ratio.split(":").map((item) => Number(item));
   if (!Number.isFinite(width) || !Number.isFinite(height) || width <= 0 || height <= 0) {
-    return 1;
+    return null;
   }
+  return { width, height };
+}
+
+function parseAspectRatioValue(ratio: string) {
+  const pair = parseAspectRatioPair(ratio);
+  if (!pair) return 1;
+  const { width, height } = pair;
   return width / height;
 }
 
-function roundEven(value: number) {
-  return Math.max(2, Math.round(value / 2) * 2);
+function ceilToMultiple(value: number, multiple: number) {
+  return Math.max(multiple, Math.ceil(value / multiple) * multiple);
+}
+
+function inferAspectRatioFromPrompt(prompt: string) {
+  const normalized = String(prompt || "").replace(/：/g, ":");
+  const match = normalized.match(/(\d{1,2})\s*(?::|比)\s*(\d{1,2})/);
+  if (!match) return undefined;
+
+  const ratio = `${Number(match[1])}:${Number(match[2])}`;
+  return (SUPPORTED_ASPECT_RATIOS as readonly string[]).includes(ratio) ? ratio : undefined;
 }
 
 function inferClosestAspectRatio(aspectValue: number) {
@@ -151,29 +168,15 @@ function resolveOpenAISize(aspectRatio: string, imageSize: "1K" | "2K" | "4K") {
     "4K": 2048,
   };
 
-  const safeRatio = parseAspectRatioValue(aspectRatio);
+  const ratioPair = parseAspectRatioPair(aspectRatio) || { width: 1, height: 1 };
   const base = baseMap[imageSize] || 1536;
   const targetPixels = Math.max(base * base, OPENAI_IMAGE_MIN_TOTAL_PIXELS);
-
-  let width: number;
-  let height: number;
-  if (safeRatio >= 1) {
-    width = roundEven(Math.sqrt(targetPixels * safeRatio));
-    height = roundEven(width / safeRatio);
-  } else {
-    height = roundEven(Math.sqrt(targetPixels / safeRatio));
-    width = roundEven(height * safeRatio);
-  }
-
-  while (width * height < targetPixels) {
-    if (safeRatio >= 1) {
-      width += 2;
-      height = roundEven(width / safeRatio);
-    } else {
-      height += 2;
-      width = roundEven(height * safeRatio);
-    }
-  }
+  const scale = ceilToMultiple(
+    Math.sqrt(targetPixels / (ratioPair.width * ratioPair.height)),
+    OPENAI_IMAGE_DIMENSION_MULTIPLE,
+  );
+  const width = ratioPair.width * scale;
+  const height = ratioPair.height * scale;
 
   return `${width}x${height}`;
 }
@@ -530,9 +533,10 @@ export function createOpenAIImage({ apiKey, baseURL }: OpenAIImageConfig) {
         const { prompt, imageUrls } = extractPromptAndImages(options.messages);
         const activeModelId = options.overrideModelId || modelId;
         const normalizedAspectRatio = normalizeAspectRatio(options.imageParams?.aspectRatio);
+        const promptAspectRatio = inferAspectRatioFromPrompt(prompt);
         const aspectRatio =
           normalizedAspectRatio === "auto"
-            ? await inferAspectRatioFromImageUrl(imageUrls[0] || "")
+            ? promptAspectRatio || (await inferAspectRatioFromImageUrl(imageUrls[0] || ""))
             : normalizedAspectRatio;
         const imageSize = normalizeImageSizeLabel(options.imageParams?.imageSize);
         const size =
@@ -546,6 +550,7 @@ export function createOpenAIImage({ apiKey, baseURL }: OpenAIImageConfig) {
           model: activeModelId,
           size,
           aspectRatio: aspectRatio || "auto",
+          promptAspectRatio: promptAspectRatio || undefined,
           imageSize,
           useBltcyFluxCompatParams: shouldUseBltcyFluxCompatParams(baseURL, activeModelId),
           imageCount: imageUrls.length,
diff --git a/public/dingtalk-callback.html b/public/dingtalk-callback.html
index 5c0c52448..aca7785b5 100644
--- a/public/dingtalk-callback.html
+++ b/public/dingtalk-callback.html
@@ -127,7 +127,7 @@
                         console.log('[DingTalk Callback] Got token:', data.token.substring(0, 10) + '...');
                         
                         // 直接在这里完成 Auth.js 登录
-                        completeLogin(data.token);
+                        completeLogin(data.token, normalizeCallbackUrl(data.callbackUrl));
                     } else {
                         throw new Error(data.error || data.message || '登录失败');
                     }
@@ -137,7 +137,18 @@
                 }
             }
             
-            async function completeLogin(token) {
+            function normalizeCallbackUrl(callbackUrl) {
+                if (typeof callbackUrl !== 'string' || !callbackUrl) return '/';
+                try {
+                    const parsed = new URL(callbackUrl, window.location.origin);
+                    if (parsed.origin !== window.location.origin) return '/';
+                    return parsed.pathname + parsed.search + parsed.hash;
+                } catch (error) {
+                    return '/';
+                }
+            }
+            
+            async function completeLogin(token, callbackUrl) {
                 try {
                     statusText.textContent = '正在登录系统...';
                     
@@ -157,7 +168,7 @@
                         body: new URLSearchParams({
                             csrfToken: csrfToken,
                             token: token,
-                            callbackUrl: '/',
+                            callbackUrl: callbackUrl,
                         }),
                         credentials: 'include',
                     });
@@ -183,14 +194,14 @@
                             // 使用 window.top.location 确保跳转整个页面（即使在 iframe 中）
                             try {
                                 if (window.top && window.top.location) {
-                                    window.top.location.replace('/');
+                                    window.top.location.replace(callbackUrl);
                                 } else {
-                                    window.location.replace('/');
+                                    window.location.replace(callbackUrl);
                                 }
                             } catch (e) {
                                 // 如果跨域阻止，使用当前窗口跳转
                                 console.warn('[DingTalk Callback] Cross-origin blocked, using current window');
-                                window.location.replace('/');
+                                window.location.replace(callbackUrl);
                             }
                         } else {
                             console.error('[DingTalk Callback] Session not created, retrying...');
@@ -201,7 +212,7 @@
                             });
                             const retrySession = await retrySessionRes.json();
                             if (retrySession && retrySession.user) {
-                                window.location.replace('/');
+                                window.location.replace(callbackUrl);
                             } else {
                                 throw new Error('登录失败：无法创建会话，请刷新页面重试');
                             }
@@ -244,4 +255,4 @@
         })();
     </script>
 </body>
-</html>
\ No newline at end of file
+</html>