feat(push): add JPush integration for offline message push

Add JPush (极光推送) integration to enable push notifications for offline users. This includes:
- New jpush client package with API for batch push notifications
- Configuration for jpush (enabled, app_key, master_secret, production mode)
- Updated push service to send messages via JPush when users are offline
- Added PushChatMessage method with do-not-disturb checking
- Integrated push service with chat service to notify offline users of new messages
- Updated deployment workflow with JPush and related environment variables

configs/config.yaml

@@ -263,6 +263,15 @@ casbin:
 report:
   auto_hide_threshold: 3  # 自动隐藏阈值，举报次数达到此数值时自动隐藏内容
 
+# 极光推送配置
+# 环境变量:
+#   APP_JPUSH_ENABLED, APP_JPUSH_APP_KEY, APP_JPUSH_MASTER_SECRET, APP_JPUSH_PRODUCTION
+jpush:
+  enabled: false
+  app_key: ""
+  master_secret: ""
+  production: false  # true: 生产环境, false: 开发环境
+
 # 初始化超级管理员密钥
 # 环境变量: APP_SETUP_SECRET
 # 设置后可使用 POST /api/v1/admin/setup-super-admin 接口初始化第一位超级管理员