Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting across multiple files for better readability.

app/services/oauth_providers/base.py

@@ -5,35 +5,35 @@ from authlib.integrations.flask_client import OAuth
 
 class OAuthProvider(ABC):
     """Abstract base class for OAuth providers."""
-    
+
     def __init__(self, oauth: OAuth, client_id: str, client_secret: str):
         self.oauth = oauth
         self.client_id = client_id
         self.client_secret = client_secret
         self._client = None
-        
+
     @property
     @abstractmethod
     def name(self) -> str:
         """Provider name (e.g., 'google', 'github')."""
         pass
-        
+
     @property
     @abstractmethod
     def display_name(self) -> str:
         """Human-readable provider name (e.g., 'Google', 'GitHub')."""
         pass
-        
+
     @abstractmethod
     def get_client_config(self) -> Dict[str, Any]:
         """Return OAuth client configuration."""
         pass
-        
+
     @abstractmethod
     def get_user_info(self, token: Dict[str, Any]) -> Dict[str, Any]:
         """Extract user information from OAuth token response."""
         pass
-        
+
     def get_client(self):
         """Get or create OAuth client."""
         if self._client is None:
@@ -42,27 +42,29 @@ class OAuthProvider(ABC):
                 name=self.name,
                 client_id=self.client_id,
                 client_secret=self.client_secret,
-                **config
+                **config,
             )
         return self._client
-        
+
     def get_authorization_url(self, redirect_uri: str) -> str:
         """Generate authorization URL for OAuth flow."""
         client = self.get_client()
         return client.authorize_redirect(redirect_uri).location
-        
-    def exchange_code_for_token(self, code: str = None, redirect_uri: str = None) -> Dict[str, Any]:
+
+    def exchange_code_for_token(
+        self, code: str = None, redirect_uri: str = None
+    ) -> Dict[str, Any]:
         """Exchange authorization code for access token."""
         client = self.get_client()
         token = client.authorize_access_token()
         return token
-        
+
     def normalize_user_data(self, user_info: Dict[str, Any]) -> Dict[str, Any]:
         """Normalize user data to common format."""
         return {
-            'id': user_info.get('id'),
-            'email': user_info.get('email'),
-            'name': user_info.get('name'),
-            'picture': user_info.get('picture'),
-            'provider': self.name
-        }
+            "id": user_info.get("id"),
+            "email": user_info.get("email"),
+            "name": user_info.get("name"),
+            "picture": user_info.get("picture"),
+            "provider": self.name,
+        }