refactor: reorganize import statements and improve code formatting across multiple files

backend/app/api/agent.py

@@ -3,8 +3,7 @@
 from __future__ import annotations
 
 from enum import Enum
-from typing import TYPE_CHECKING, Any
-from typing import cast
+from typing import TYPE_CHECKING, Any, cast
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, Query, status

backend/app/api/board_group_memory.py

@@ -4,11 +4,10 @@ from __future__ import annotations
 
 import asyncio
 import json
-from enum import Enum
 from dataclasses import dataclass
 from datetime import UTC, datetime
-from typing import TYPE_CHECKING
-from typing import cast
+from enum import Enum
+from typing import TYPE_CHECKING, cast
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Request, status

backend/app/api/boards.py

@@ -3,8 +3,7 @@
 from __future__ import annotations
 
 from enum import Enum
-from typing import TYPE_CHECKING, Literal
-from typing import cast
+from typing import TYPE_CHECKING, Literal, cast
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, Query, status