feat(notifications): per-chat mute settings

- add chat_notification_settings table and migration
- add chat notifications API (get/update muted)
- skip message notifications for muted recipients
- add mute/unmute control in chat info panel

app/chats/service.py

@@ -4,7 +4,16 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.chats import repository
 from app.chats.models import Chat, ChatMember, ChatMemberRole, ChatType
-from app.chats.schemas import ChatCreateRequest, ChatDeleteRequest, ChatDiscoverRead, ChatPinMessageRequest, ChatRead, ChatTitleUpdateRequest
+from app.chats.schemas import (
+    ChatCreateRequest,
+    ChatDeleteRequest,
+    ChatDiscoverRead,
+    ChatNotificationSettingsRead,
+    ChatNotificationSettingsUpdate,
+    ChatPinMessageRequest,
+    ChatRead,
+    ChatTitleUpdateRequest,
+)
 from app.messages.repository import (
     delete_messages_in_chat,
     get_hidden_message,
@@ -420,3 +429,41 @@ async def clear_chat_for_user(db: AsyncSession, *, chat_id: int, user_id: int) -
             continue
         await hide_message_for_user(db, message_id=message_id, user_id=user_id)
     await db.commit()
+
+
+async def get_chat_notification_settings_for_user(
+    db: AsyncSession,
+    *,
+    chat_id: int,
+    user_id: int,
+) -> ChatNotificationSettingsRead:
+    await ensure_chat_membership(db, chat_id=chat_id, user_id=user_id)
+    setting = await repository.get_chat_notification_setting(db, chat_id=chat_id, user_id=user_id)
+    return ChatNotificationSettingsRead(
+        chat_id=chat_id,
+        user_id=user_id,
+        muted=bool(setting and setting.muted),
+    )
+
+
+async def update_chat_notification_settings_for_user(
+    db: AsyncSession,
+    *,
+    chat_id: int,
+    user_id: int,
+    payload: ChatNotificationSettingsUpdate,
+) -> ChatNotificationSettingsRead:
+    await ensure_chat_membership(db, chat_id=chat_id, user_id=user_id)
+    setting = await repository.upsert_chat_notification_setting(
+        db,
+        chat_id=chat_id,
+        user_id=user_id,
+        muted=payload.muted,
+    )
+    await db.commit()
+    await db.refresh(setting)
+    return ChatNotificationSettingsRead(
+        chat_id=chat_id,
+        user_id=user_id,
+        muted=setting.muted,
+    )