feat(moderation): add chat bans list endpoint with admin access checks

app/chats/router.py

@@ -3,6 +3,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.auth.service import get_current_user
 from app.chats.schemas import (
+    ChatBanRead,
     ChatCreateRequest,
     ChatDetailRead,
     ChatDiscoverRead,
@@ -38,6 +39,7 @@ from app.chats.service import (
     leave_chat_for_user,
     pin_chat_message_for_user,
     remove_chat_member_for_user,
+    list_chat_bans_for_user,
     serialize_chat_for_user,
     serialize_chats_for_user,
     set_chat_archived_for_user,
@@ -226,6 +228,15 @@ async def ban_chat_member(
     await realtime_gateway.publish_chat_updated(chat_id=chat_id)
 
 
+@router.get("/{chat_id}/bans", response_model=list[ChatBanRead])
+async def list_chat_bans(
+    chat_id: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+) -> list[ChatBanRead]:
+    return await list_chat_bans_for_user(db, chat_id=chat_id, actor_user_id=current_user.id)
+
+
 @router.delete("/{chat_id}/bans/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def unban_chat_member(
     chat_id: int,