feat(session): 实现同平台抢登互踢功能，优化会话踢下线逻辑

新增同平台会话踢下线能力，将iOS/Android/mobile归为同一移动分组，web仅匹配web；扩展会话存储接口支持按平台、带原因踢除会话，同步更新集群广播逻辑与各调用点，统一传递踢下线原因参数

server/user.go

@@ -824,7 +824,7 @@ func changeUserState(s *Session, uid types.Uid, user *types.User, msg *ClientCom
 
 	if state != types.StateOK {
 		// Terminate all sessions.
-		globals.sessionStore.EvictUser(uid, "")
+		globals.sessionStore.EvictUser(uid, "", "user_state_changed")
 		publishRealtimeEvictUser(s.tenantID, uid, "user_state_changed", "")
 	}
 
@@ -900,7 +900,7 @@ func replyDelUser(s *Session, msg *ClientComMessage) {
 	}
 
 	// Terminate all sessions. Skip the current session so the requester gets a response.
-	globals.sessionStore.EvictUser(uid, s.sid)
+	globals.sessionStore.EvictUser(uid, s.sid, "user_deleted")
 	publishRealtimeEvictUser(s.tenantID, uid, "user_deleted", s.sid)
 	// Remove user from cache and announce to cluster that the user is deleted.
 	usersRemoveUser(msg.TenantID, uid)
@@ -944,7 +944,9 @@ func replyDelUser(s *Session, msg *ClientComMessage) {
 	if s.uid == uid && s.multi == nil {
 		// Evict the current session if it belongs to the deleted user.
 		// No need to send it to multiplexing session: remote node will be notified separately.
-		_, data := s.serialize(NoErrEvicted("", "", msg.Timestamp))
+		evicted := NoErrEvicted("", "", msg.Timestamp)
+		evicted.Ctrl.Params = map[string]any{"reason": "user_deleted"}
+		_, data := s.serialize(evicted)
 		s.stopSession(data)
 	}
 }