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

web/src/api/chats.ts

@@ -2,6 +2,12 @@ import { http } from "./http";
 import type { Chat, ChatDetail, ChatMember, ChatMemberRole, ChatType, DiscoverChat, Message, MessageType } from "../chat/types";
 import axios from "axios";
 
+export interface ChatNotificationSettings {
+  chat_id: number;
+  user_id: number;
+  muted: boolean;
+}
+
 export async function getChats(query?: string): Promise<Chat[]> {
   const { data } = await http.get<Chat[]>("/chats", {
     params: query?.trim() ? { query: query.trim() } : undefined
@@ -207,3 +213,13 @@ export async function removeChatMember(chatId: number, userId: number): Promise<
 export async function leaveChat(chatId: number): Promise<void> {
   await http.post(`/chats/${chatId}/leave`);
 }
+
+export async function getChatNotificationSettings(chatId: number): Promise<ChatNotificationSettings> {
+  const { data } = await http.get<ChatNotificationSettings>(`/chats/${chatId}/notifications`);
+  return data;
+}
+
+export async function updateChatNotificationSettings(chatId: number, muted: boolean): Promise<ChatNotificationSettings> {
+  const { data } = await http.put<ChatNotificationSettings>(`/chats/${chatId}/notifications`, { muted });
+  return data;
+}