fix: mcp with token should work

backend/src/api/app.py

@@ -4,8 +4,8 @@ from pathlib import Path
 
 import asyncpg
 from dishka.integrations.fastapi import DishkaRoute, FromDishka, setup_dishka
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
-from fastapi.responses import FileResponse
+from fastapi.responses import FileResponse, RedirectResponse
 from fastmcp.utilities.lifespan import combine_lifespans
 from starlette.applications import Starlette
 
@@ -88,6 +88,13 @@ app.include_router(watches.router)
 
 app.mount("/mcp", mcp_app)
 
+
+@app.api_route("/mcp", methods=["GET", "POST", "DELETE"])
+async def mcp_trailing_slash(request: Request) -> RedirectResponse:
+    query = request.url.query
+    return RedirectResponse(f"/mcp/?{query}" if query else "/mcp/", status_code=307)
+
+
 _spa_dir = Path(env.api.static_dir).resolve()
 if _spa_dir.is_dir():
     _spa_index = _spa_dir / "index.html"