Fix: Correct OAuth config API endpoint path

🐛 Problem:
- Frontend calling /api/auth/oauth-config (404 error)
- Backend auth router has prefix '/auth' not '/api/auth'
- Endpoint should be /auth/oauth-config

✅ Solution:
- Changed frontend API call from /api/auth/oauth-config to /auth/oauth-config
- Matches backend router prefix configuration

🔧 Technical Details:
- auth router: APIRouter(prefix='/auth')
- Correct endpoint: /auth/oauth-config
- This should resolve 404 errors and allow OAuth config fetch

🎯 Expected Result:
- OAuth config API call should now succeed
- Should get client_id from backend
- Login process should work correctly

frontend/src/context/AuthContext.tsx

@@ -219,29 +219,29 @@ export function AuthProvider({ children }: { children: ReactNode }) {
       if (isHFSpaces) {
         // In HF Spaces, get OAuth config from backend API
         console.log("🔐 Getting OAuth config from backend");
-        
+
         try {
-          const response = await fetch('/api/auth/oauth-config');
+          const response = await fetch("/auth/oauth-config");
           const oauthConfig = await response.json();
-          
+
           if (!oauthConfig.oauth_enabled) {
             throw new Error("OAuth not enabled or configured on backend");
           }
-          
+
           console.log("✅ OAuth config received:", {
             client_id: oauthConfig.client_id?.substring(0, 8) + "...",
             scopes: oauthConfig.scopes,
-            provider_url: oauthConfig.provider_url
+            provider_url: oauthConfig.provider_url,
           });
-          
+
           // Direct OAuth URL construction with backend-provided client_id
           const baseUrl = window.location.origin;
           const redirectUri = `${baseUrl}/oauth-callback`;
-          
+
           // Create state for CSRF protection
           const state = Math.random().toString(36).substring(2, 15);
           localStorage.setItem("oauth_state", state);
-          
+
           // Use HF OAuth endpoint with proper client_id from backend
           const oauthUrl =
             `${oauthConfig.provider_url}/oauth/authorize?` +
@@ -251,12 +251,14 @@ export function AuthProvider({ children }: { children: ReactNode }) {
             `scope=${encodeURIComponent(oauthConfig.scopes)}&` +
             `state=${state}&` +
             `prompt=consent`;
-          
+
           console.log("🔄 Redirecting to HF OAuth with client_id");
           window.location.href = oauthUrl;
-          
         } catch (configError) {
-          console.error("Failed to get OAuth config from backend:", configError);
+          console.error(
+            "Failed to get OAuth config from backend:",
+            configError
+          );
           throw new Error("OAuth configuration not available from backend");
         }
       } else {