fix: 改进RMBG API错误处理 - 添加超时控制和网络连接错误提示

app/api/rmbg/route.ts

@@ -187,11 +187,63 @@ export async function POST(request: NextRequest) {
     }
 
     const startTime = Date.now();
-    const response = await fetch(apiUrl, {
-      method: "POST",
-      headers,
-      body: JSON.stringify(requestBody),
-    });
+    let response: Response;
+    
+    try {
+      // 添加超时控制（30秒）
+      const controller = new AbortController();
+      const timeoutId = setTimeout(() => controller.abort(), 30000);
+      
+      response = await fetch(apiUrl, {
+        method: "POST",
+        headers,
+        body: JSON.stringify(requestBody),
+        signal: controller.signal,
+      });
+      
+      clearTimeout(timeoutId);
+    } catch (fetchError) {
+      const processingTime = (Date.now() - startTime) / 1000;
+      console.error("[RMBG API] 网络请求失败:", {
+        error: fetchError,
+        apiUrl,
+        processingTime,
+      });
+      
+      // 检查是否是网络连接错误
+      if (fetchError instanceof Error) {
+        if (fetchError.name === 'AbortError') {
+          return NextResponse.json(
+            { 
+              error: "抠图API请求超时",
+              detail: "请求超过30秒未响应，请检查API服务器状态或网络连接",
+            },
+            { status: 504 }
+          );
+        }
+        
+        if (fetchError.message.includes('EHOSTUNREACH') || 
+            fetchError.message.includes('ENOTFOUND') ||
+            fetchError.message.includes('ECONNREFUSED') ||
+            fetchError.message.includes('No route to host')) {
+          return NextResponse.json(
+            { 
+              error: "无法连接到抠图API服务器",
+              detail: `服务器无法访问 ${apiUrl}，请检查：\n1. API服务器是否在线\n2. 网络连接是否正常\n3. 防火墙设置是否正确`,
+            },
+            { status: 503 }
+          );
+        }
+      }
+      
+      return NextResponse.json(
+        { 
+          error: "抠图API请求失败",
+          detail: fetchError instanceof Error ? fetchError.message : "未知网络错误",
+        },
+        { status: 500 }
+      );
+    }
 
     const processingTime = (Date.now() - startTime) / 1000;
 
@@ -201,6 +253,7 @@ export async function POST(request: NextRequest) {
         status: response.status,
         statusText: response.statusText,
         error: errorText,
+        apiUrl,
       });
       
       return NextResponse.json(