feat(player/admin/api): 站内邮箱、在线状态、员工菜单权限与内容管理增强

API:
- 新增 player-messages 域：充值审核通过/拒绝、Banner/公告推广消息，支持多语言模板
- 新增 presence 域：Redis 心跳在线状态，管理端可查询在线玩家数
- User 表增加 visible_menus 字段；新增 player_messages 表及迁移
- 充值审核通过/拒绝时按系统配置自动写入玩家站内消息
- 管理端新增 GET /deposit-orders/pending-count、GET /presence/online-count
- 玩家端新增消息 CRUD、presence/ping、home 返回 inbox 开关配置
- 员工管理支持 visibleMenus 配置与删除保护（不能删自己/最后超管）
- SystemConfig 增加 inbox 功能开关及各类通知开关

Admin:
- 员工管理：按角色默认菜单 + 可勾选可见菜单项
- ManageLayout：按 visibleMenus 过滤侧栏；充值待审数量角标轮询
- Contents：富文本编辑器、图片字段组件重构
- DashboardPlayers：展示在线玩家数；AdminPlayerStatusCell 在线状态列
- 多页面 i18n 与权限细节调整

Player:
- 站内邮箱中心（InboxHub）：消息列表/详情、未读角标、一键已读/删除
- 公告列表与详情页；走马灯可跳转详情
- 客服 Modal 改为 Panel，与邮箱 Hub 整合
- 充值状态轮询通知；presence 心跳；BetSlip 清空二次确认
- HomeView 今日赛事板块；FootballView 等体验优化

Shared: 新增 CANNOT_DELETE_SELF、STAFF_NOT_FOUND、MESSAGE_NOT_FOUND 等错误码
Docs: 玩家端缺失功能分析文档
Chore: 移除 .agents/skills 设计类 skill 文件
Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/prisma/migrations/20260617083520_add_visible_menus/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "users" ADD COLUMN     "visible_menus" VARCHAR(1000);

apps/api/prisma/migrations/20260617120000_player_messages/migration.sql

@@ -0,0 +1,22 @@
+-- CreateTable
+CREATE TABLE "player_messages" (
+    "id" BIGSERIAL NOT NULL,
+    "user_id" BIGINT NOT NULL,
+    "type" VARCHAR(32) NOT NULL,
+    "title" VARCHAR(256) NOT NULL,
+    "body" TEXT NOT NULL,
+    "payload" JSONB,
+    "read_at" TIMESTAMP(3),
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "player_messages_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "player_messages_user_id_created_at_idx" ON "player_messages"("user_id", "created_at" DESC);
+
+-- CreateIndex
+CREATE INDEX "player_messages_user_id_read_at_idx" ON "player_messages"("user_id", "read_at");
+
+-- AddForeignKey
+ALTER TABLE "player_messages" ADD CONSTRAINT "player_messages_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;

apps/api/prisma/schema.prisma

@@ -23,6 +23,7 @@ model User {
   createdAt       DateTime  @default(now()) @map("created_at")
   updatedAt       DateTime  @updatedAt @map("updated_at")
   deletedAt       DateTime? @map("deleted_at")
+  visibleMenus    String?   @map("visible_menus") @db.VarChar(1000)
 
   auth          UserAuth?
   wallet        Wallet?
@@ -31,6 +32,7 @@ model User {
   bets          Bet[]
   preferences   UserPreference?
   depositOrders DepositOrder[]  @relation("PlayerDepositOrders")
+  playerMessages PlayerMessage[]
 
   parent         User?        @relation("UserHierarchy", fields: [parentId], references: [id])
   children       User[]       @relation("UserHierarchy")
@@ -813,6 +815,23 @@ model DepositOrderAuditLog {
   @@map("deposit_order_audit_logs")
 }
 
+model PlayerMessage {
+  id        BigInt    @id @default(autoincrement())
+  userId    BigInt    @map("user_id")
+  type      String    @db.VarChar(32)
+  title     String    @db.VarChar(256)
+  body      String    @db.Text
+  payload   Json?
+  readAt    DateTime? @map("read_at")
+  createdAt DateTime  @default(now()) @map("created_at")
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@index([userId, createdAt(sort: Desc)])
+  @@index([userId, readAt])
+  @@map("player_messages")
+}
+
 // ============ System Config & Audit ============
 
 model SystemConfig {