Fix: Correct OAuth callback URL path mismatch

🐛 Problem:
- Frontend uses /oauth-callback but backend expects /auth/oauth-callback
- HF OAuth redirects to /oauth-callback which returns 404
- Path inconsistency between frontend and backend routes

✅ Solution:
- Updated frontend redirectUri to use /auth/oauth-callback
- Updated backend redirect_uri construction to match
- Now both frontend and backend use consistent /auth/oauth-callback path

🔧 Technical Changes:
Frontend:
- AuthContext: redirectUri = /auth/oauth-callback

Backend:
- auth.py: redirect_uri = /auth/oauth-callback (all instances)
- Maintains router prefix consistency: /auth + /oauth-callback

🎯 Expected Result:
- OAuth callback should now route correctly to backend handler
- No more 404 errors after HF authorization
- Complete OAuth flow from authorization to app login

backend/routers/auth.py

@@ -114,7 +114,7 @@ async def login(request: Request):
     else:
         base_url = str(request.base_url).rstrip('/')
         
-    redirect_uri = f"{base_url}/oauth-callback"
+    redirect_uri = f"{base_url}/auth/oauth-callback"
     
     # Build authorization URL
     auth_url = (
@@ -189,7 +189,7 @@ async def handle_oauth_callback(request: Request, code: str, state: str):
     else:
         base_url = str(request.base_url).rstrip('/')
         
-    redirect_uri = f"{base_url}/oauth-callback"
+    redirect_uri = f"{base_url}/auth/oauth-callback"
     
     try:
         token_response = requests.post(

frontend/src/context/AuthContext.tsx

@@ -236,7 +236,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
 
           // Direct OAuth URL construction with backend-provided client_id
           const baseUrl = window.location.origin;
-          const redirectUri = `${baseUrl}/oauth-callback`;
+          const redirectUri = `${baseUrl}/auth/oauth-callback`;
 
           // Create state for CSRF protection
           const state = Math.random().toString(36).substring(2, 15);