feat: add PATCH /user/settings/password endpoint for changing password

Register the fixed /password route before the wildcard /{option} to
prevent FastAPI from matching it as a path parameter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sqlmodels/__init__.py

@@ -3,6 +3,7 @@ from .auth_identity import (
     AuthIdentityResponse,
     AuthProviderType,
     BindIdentityRequest,
+    ChangePasswordRequest,
 )
 from .user import (
     BatchDeleteRequest,