fix: handle SnapGen image task failures

lib/ai/providers/snapgen-image.ts

@@ -374,9 +374,23 @@ function extractErrorMessage(payload: any): string {
     payload?.detail?.error_message ||
     payload?.detail?.error ||
     payload?.detail?.message ||
+    payload?.detail?.status_desc ||
+    payload?.data?.error_message ||
+    payload?.data?.error?.message ||
+    payload?.data?.error ||
+    payload?.data?.message ||
+    payload?.data?.msg ||
+    payload?.data?.status_desc ||
+    payload?.data?.state_detail ||
+    payload?.data?.err_message ||
+    payload?.data?.err_info ||
     payload?.error_message ||
     payload?.error?.message ||
     payload?.error ||
+    payload?.status_desc ||
+    payload?.state_detail ||
+    payload?.err_message ||
+    payload?.err_info ||
     payload?.message ||
     payload?.msg ||
     "SnapGen 任务执行失败"
@@ -808,7 +822,13 @@ async function buildRequestForm({
   }
 }
 
-async function waitForHistoryResult(baseURL: string, apiKey: string, uuid: string, sourceUrls: string[]) {
+async function waitForHistoryResult(
+  baseURL: string,
+  apiKey: string,
+  uuid: string,
+  sourceUrls: string[],
+  context: { apiFormat: SnapgenApiFormat; model: string }
+) {
   for (let attempt = 1; attempt <= POLL_MAX_ATTEMPTS; attempt++) {
     const response = await fetch(
       joinApiPath(baseURL, `/uapi/v1/history/${encodeURIComponent(uuid)}`),
@@ -818,7 +838,17 @@ async function waitForHistoryResult(baseURL: string, apiKey: string, uuid: strin
 
     if (!response.ok) {
       if (attempt === POLL_MAX_ATTEMPTS) {
-        throw new Error(`${extractErrorMessage(payload)} (HTTP ${response.status})`);
+        const errorMessage = extractErrorMessage(payload);
+        console.error("[SnapGen Image] History request failed:", {
+          uuid,
+          model: context.model,
+          apiFormat: context.apiFormat,
+          attempt,
+          status: response.status,
+          error: errorMessage,
+          responseSnippet: compactPayloadSnippet(payload),
+        });
+        throw new Error(`${errorMessage} (HTTP ${response.status})`);
       }
       await new Promise((resolve) => setTimeout(resolve, POLL_INTERVAL_MS));
       continue;
@@ -832,9 +862,27 @@ async function waitForHistoryResult(baseURL: string, apiKey: string, uuid: strin
 
     const statusCode = extractStatusCode(payload);
     if (statusCode === 3) {
-      throw new Error(extractErrorMessage(payload));
+      const errorMessage = extractErrorMessage(payload);
+      console.error("[SnapGen Image] History task failed:", {
+        uuid,
+        model: context.model,
+        apiFormat: context.apiFormat,
+        attempt,
+        statusCode,
+        error: errorMessage,
+        responseSnippet: compactPayloadSnippet(payload),
+      });
+      throw new Error(errorMessage);
     }
     if (statusCode === 2) {
+      console.error("[SnapGen Image] History task completed without images:", {
+        uuid,
+        model: context.model,
+        apiFormat: context.apiFormat,
+        attempt,
+        statusCode,
+        responseSnippet: compactPayloadSnippet(payload),
+      });
       throw new Error("SnapGen 任务已完成但未返回图片地址");
     }
 
@@ -920,10 +968,18 @@ export function createSnapgenImage({ apiKey, baseURL }: SnapgenImageConfig) {
           formData,
         });
 
-        let outputUrls: string[] = [];
-        let base64Images: Array<{ buffer: Buffer; mimeType: string }> = [];
         const statusCode = extractStatusCode(createPayload);
         const uuid = extractUuid(createPayload);
+        console.log("[SnapGen Image] Create task response:", {
+          model: runtimeModelId,
+          apiFormat,
+          statusCode,
+          uuid: uuid || null,
+          responseSnippet: compactPayloadSnippet(createPayload),
+        });
+
+        let outputUrls: string[] = [];
+        let base64Images: Array<{ buffer: Buffer; mimeType: string }> = [];
         if (statusCode === 3) {
           throw new Error(extractErrorMessage(createPayload));
         }
@@ -939,7 +995,10 @@ export function createSnapgenImage({ apiKey, baseURL }: SnapgenImageConfig) {
               `SnapGen 创建任务成功，但未返回 uuid 或图片结果，响应片段: ${compactPayloadSnippet(createPayload)}`
             );
           }
-          const historyResult = await waitForHistoryResult(baseURL, apiKey, uuid, imageUrls);
+          const historyResult = await waitForHistoryResult(baseURL, apiKey, uuid, imageUrls, {
+            apiFormat,
+            model: runtimeModelId,
+          });
           outputUrls = historyResult.imageUrls;
           base64Images = historyResult.base64Images;
         }

lib/ai/runtime/model-health.ts

@@ -238,6 +238,16 @@ export function classifyAiModelHealthFailure(error: unknown): {
 export function shouldFailoverAiModelError(error: unknown) {
   const classification = classifyAiModelHealthFailure(error);
   const normalized = getErrorMessage(error).toLowerCase();
+  const imageProviderTaskFailed =
+    normalized.includes("image generation failed") ||
+    normalized.includes("snapgen 任务执行失败") ||
+    normalized.includes("snapgen 创建任务成功") ||
+    normalized.includes("snapgen 任务已完成但未返回图片地址") ||
+    normalized.includes("snapgen 未返回可用图片");
+
+  if (imageProviderTaskFailed) {
+    return true;
+  }
 
   if (classification.reason === "user_cancelled" || classification.reason === "non_provider_failure") {
     return false;