refactor: reorganize import statements for consistency across multiple files

app/models/activity.py

@@ -7,10 +7,12 @@ from enum import StrEnum
 from typing import Any
 
 from pydantic import BaseModel, ConfigDict, Field
-from sqlalchemy import DateTime, Enum as SqlEnum, ForeignKey, Integer, func, text
+from sqlalchemy import DateTime, ForeignKey, Integer, func, text
+from sqlalchemy import Enum as SqlEnum
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import Mapped, mapped_column, relationship
-from sqlalchemy.types import JSON as SA_JSON, TypeDecorator
+from sqlalchemy.types import JSON as SA_JSON
+from sqlalchemy.types import TypeDecorator
 
 from app.models.base import Base, enum_values