semantics update

backend/src/app.py

@@ -11,7 +11,7 @@ from pathlib import Path
 project_root = Path(__file__).resolve().parent.parent.parent
 sys.path.append(str(project_root))
 
-from fastapi import FastAPI, WebSocket, WebSocketDisconnect, Depends, Request
+from fastapi import FastAPI, WebSocket, WebSocketDisconnect, Depends, Request, HTTPException
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
 from fastapi.responses import FileResponse
@@ -138,6 +138,10 @@ if frontend_path.exists():
     # Serve other static files from the root of build directory
     @app.get("/{file_path:path}")
     async def serve_spa(file_path: str):
+        # Don't serve SPA for API routes that fell through
+        if file_path.startswith("api/"):
+            raise HTTPException(status_code=404, detail="API endpoint not found")
+            
         full_path = frontend_path / file_path
         if full_path.is_file():
             return FileResponse(str(full_path))