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/router.py

@@ -10,6 +10,8 @@ from app.chats.schemas import (
     ChatMemberAddRequest,
     ChatMemberRead,
     ChatMemberRoleUpdateRequest,
+    ChatNotificationSettingsRead,
+    ChatNotificationSettingsUpdate,
     ChatPinMessageRequest,
     ChatRead,
     ChatTitleUpdateRequest,
@@ -22,6 +24,7 @@ from app.chats.service import (
     discover_public_chats_for_user,
     ensure_saved_messages_chat,
     get_chat_for_user,
+    get_chat_notification_settings_for_user,
     get_chats_for_user,
     join_public_chat_for_user,
     leave_chat_for_user,
@@ -30,6 +33,7 @@ from app.chats.service import (
     serialize_chat_for_user,
     serialize_chats_for_user,
     update_chat_member_role_for_user,
+    update_chat_notification_settings_for_user,
     update_chat_title_for_user,
 )
 from app.database.session import get_db
@@ -200,3 +204,27 @@ async def pin_chat_message(
 ) -> ChatRead:
     chat = await pin_chat_message_for_user(db, chat_id=chat_id, user_id=current_user.id, payload=payload)
     return await serialize_chat_for_user(db, user_id=current_user.id, chat=chat)
+
+
+@router.get("/{chat_id}/notifications", response_model=ChatNotificationSettingsRead)
+async def get_chat_notifications(
+    chat_id: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+) -> ChatNotificationSettingsRead:
+    return await get_chat_notification_settings_for_user(db, chat_id=chat_id, user_id=current_user.id)
+
+
+@router.put("/{chat_id}/notifications", response_model=ChatNotificationSettingsRead)
+async def update_chat_notifications(
+    chat_id: int,
+    payload: ChatNotificationSettingsUpdate,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+) -> ChatNotificationSettingsRead:
+    return await update_chat_notification_settings_for_user(
+        db,
+        chat_id=chat_id,
+        user_id=current_user.id,
+        payload=payload,
+    )