refactor: consolidate login audit logging and add superadmin user audit endpoints

gatehouse_app/services/audit_service.py

@@ -214,7 +214,7 @@ class AuditService:
     ):
         """Log external auth login event."""
         return AuditService.log_action(
-            action=AuditAction.EXTERNAL_AUTH_LOGIN,
+            action=AuditAction.USER_LOGIN,
             user_id=user_id,
             organization_id=organization_id,
             resource_type="session",

gatehouse_app/services/auth_service.py

@@ -176,15 +176,6 @@ class AuthService:
         )
         session.save()
 
-        # Log session creation
-        AuditService.log_action(
-            action=AuditAction.SESSION_CREATE,
-            user_id=user.id,
-            resource_type="session",
-            resource_id=session.id,
-            description="User session created",
-        )
-
         return session
 
     @staticmethod
@@ -254,9 +245,9 @@ class AuthService:
         if session:
             session.revoke(reason=reason)
 
-            # Log session revocation
+            # Log session revocation (user logout)
             AuditService.log_action(
-                action=AuditAction.SESSION_REVOKE,
+                action=AuditAction.USER_LOGOUT,
                 user_id=session.user_id,
                 resource_type="session",
                 resource_id=session.id,