fix: build frontend serve files fails 404

frontend/vite.config.ts

@@ -3,6 +3,7 @@ import react from "@vitejs/plugin-react";
 
 export default defineConfig({
   plugins: [react()],
+  base: "./",
   server: {
     proxy: {
       "/api/logs/stream": {

server.py

@@ -768,18 +768,21 @@ def _serialize_analysis(analysis):
 _FRONTEND_DIR = BASE_DIR / "frontend" / "dist"
 
 if _FRONTEND_DIR.is_dir():
-    # Serve static assets (JS, CSS, images)
-    app.mount("/assets", StaticFiles(directory=_FRONTEND_DIR / "assets"), name="static-assets")
-
-    @app.get("/{full_path:path}")
-    async def serve_frontend(full_path: str):
-        """Serve the React SPA for any non-API route."""
-        # Try to serve the exact file first (e.g. favicon.ico)
-        file_path = _FRONTEND_DIR / full_path
-        if full_path and file_path.is_file() and file_path.is_relative_to(_FRONTEND_DIR):
-            return FileResponse(file_path)
-        # Otherwise serve index.html (SPA client-side routing)
-        return FileResponse(_FRONTEND_DIR / "index.html")
+    from starlette.exceptions import HTTPException as _StarletteHTTPException
+
+    class _SPAStaticFiles(StaticFiles):
+        """StaticFiles with SPA fallback: unknown paths serve index.html."""
+
+        async def get_response(self, path, scope):
+            try:
+                return await super().get_response(path, scope)
+            except _StarletteHTTPException as e:
+                if e.status_code == 404:
+                    return await super().get_response(".", scope)
+                raise
+
+    app.mount("/", _SPAStaticFiles(directory=str(_FRONTEND_DIR), html=True), name="frontend")
+    logger.info("Mounted frontend from %s", _FRONTEND_DIR)
 
 
 if __name__ == "__main__":