优化静态路由

backend/main.py

@@ -1,7 +1,7 @@
 import os
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse, JSONResponse
 from contextlib import asynccontextmanager
 from dotenv import load_dotenv
 
@@ -33,6 +33,16 @@ app.include_router(shares.router, prefix="/api/share")
 app.include_router(sectors.router, prefix="/api/sectors")
 
 # 生产模式：后端同时托管前端静态文件
+# catch-all 路由在 API 路由之后注册，所以 API 优先级更高
 dist_path = os.path.join(os.path.dirname(__file__), "dist")
 if os.path.isdir(dist_path):
-    app.mount("/", StaticFiles(directory=dist_path, html=True), name="static")
+    @app.get("/{full_path:path}")
+    async def serve_spa(full_path: str):
+        file_path = os.path.join(dist_path, full_path) if full_path else os.path.join(dist_path, "index.html")
+        if os.path.isfile(file_path):
+            return FileResponse(file_path)
+        # SPA fallback: 非文件路径统一返回 index.html
+        index_path = os.path.join(dist_path, "index.html")
+        if os.path.isfile(index_path):
+            return FileResponse(index_path, media_type="text/html")
+        return JSONResponse({"detail": "Not Found"}, status_code=404)