Refactor code for improved readability and consistency

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

app/services/oauth_providers/registry.py

@@ -8,38 +8,38 @@ from .github import GitHubOAuthProvider
 
 class OAuthProviderRegistry:
     """Registry for OAuth providers."""
-    
+
     def __init__(self, oauth: OAuth):
         self.oauth = oauth
         self._providers: Dict[str, OAuthProvider] = {}
         self._initialize_providers()
-        
+
     def _initialize_providers(self):
         """Initialize available providers based on environment variables."""
         # Google OAuth
-        google_client_id = os.getenv('GOOGLE_CLIENT_ID')
-        google_client_secret = os.getenv('GOOGLE_CLIENT_SECRET')
+        google_client_id = os.getenv("GOOGLE_CLIENT_ID")
+        google_client_secret = os.getenv("GOOGLE_CLIENT_SECRET")
         if google_client_id and google_client_secret:
-            self._providers['google'] = GoogleOAuthProvider(
+            self._providers["google"] = GoogleOAuthProvider(
                 self.oauth, google_client_id, google_client_secret
             )
-            
+
         # GitHub OAuth
-        github_client_id = os.getenv('GITHUB_CLIENT_ID')
-        github_client_secret = os.getenv('GITHUB_CLIENT_SECRET')
+        github_client_id = os.getenv("GITHUB_CLIENT_ID")
+        github_client_secret = os.getenv("GITHUB_CLIENT_SECRET")
         if github_client_id and github_client_secret:
-            self._providers['github'] = GitHubOAuthProvider(
+            self._providers["github"] = GitHubOAuthProvider(
                 self.oauth, github_client_id, github_client_secret
             )
-            
+
     def get_provider(self, name: str) -> Optional[OAuthProvider]:
         """Get OAuth provider by name."""
         return self._providers.get(name)
-        
+
     def get_available_providers(self) -> Dict[str, OAuthProvider]:
         """Get all available providers."""
         return self._providers.copy()
-        
+
     def is_provider_available(self, name: str) -> bool:
         """Check if provider is available."""
-        return name in self._providers
+        return name in self._providers