Deploy: Consolidated gold tables, fixed nginx docs routing

api/routes/auth.py

@@ -294,6 +294,9 @@ async def oauth_callback(
                     if 'error' in error_data:
                         if isinstance(error_data['error'], dict):
                             error_msg = error_data['error'].get('message', error_msg)
+                            # Special handling for Facebook's "error validating web secret"
+                            if provider == 'facebook' and 'validating' in error_msg.lower() and 'secret' in error_msg.lower():
+                                error_msg = "Invalid App Secret. Please update FACEBOOK_APP_SECRET in your .env file with the correct secret from Facebook Developer Console."
                         else:
                             error_msg = str(error_data['error'])
                     # Google/other providers: {"error": "...", "error_description": "..."}