fix: simplify SPA fallback to not interfere with API routes

artifacts/api-server/src/app.ts

@@ -50,13 +50,9 @@ app.use("/api/v1", openaiRouter);
 const frontendDistPath = path.join(__dirname, "../../image-gen/dist/public");
 app.use(express.static(frontendDistPath));
 
-// SPA fallback - 所有非 API 路由都返回 index.html
-app.use((req, res, next) => {
-  if (!req.path.startsWith("/api") && !req.path.startsWith("/v1")) {
-    res.sendFile(path.join(frontendDistPath, "index.html"));
-  } else {
-    next();
-  }
+// SPA fallback - 只在沒有找到靜態檔案時返回 index.html
+app.use((req, res) => {
+  res.sendFile(path.join(frontendDistPath, "index.html"));
 });
 
 export default app;