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/sessionstore.go

@@ -304,13 +304,16 @@ func (ss *SessionStore) Shutdown() {
 }
 
 // EvictUser terminates all sessions of a given user.
-func (ss *SessionStore) EvictUser(uid types.Uid, skipSid string) {
+func (ss *SessionStore) EvictUser(uid types.Uid, skipSid string, reason ...string) {
 	ss.lock.Lock()
 	defer ss.lock.Unlock()
 
 	// FIXME: this probably needs to be optimized. This may take very long time if the node hosts 100000 sessions.
 	evicted := NoErrEvicted("", "", types.TimeNow())
 	evicted.AsUser = uid.UserId()
+	if len(reason) > 0 && reason[0] != "" {
+		evicted.Ctrl.Params = map[string]any{"reason": reason[0]}
+	}
 	for _, s := range ss.sessCache {
 		if s.uid == uid && !s.isMultiplex() && s.sid != skipSid {
 			_, data := s.serialize(evicted)
@@ -326,7 +329,7 @@ func (ss *SessionStore) EvictUser(uid types.Uid, skipSid string) {
 }
 
 // EvictUserDevice terminates all sessions of a given user connected with a device.
-func (ss *SessionStore) EvictUserDevice(uid types.Uid, deviceID string) int {
+func (ss *SessionStore) EvictUserDevice(uid types.Uid, deviceID string, reason ...string) int {
 	ss.lock.Lock()
 	defer ss.lock.Unlock()
 
@@ -335,6 +338,9 @@ func (ss *SessionStore) EvictUserDevice(uid types.Uid, deviceID string) int {
 	}
 	evicted := NoErrEvicted("", "", types.TimeNow())
 	evicted.AsUser = uid.UserId()
+	if len(reason) > 0 && reason[0] != "" {
+		evicted.Ctrl.Params = map[string]any{"reason": reason[0]}
+	}
 	count := 0
 	for _, s := range ss.sessCache {
 		if s.uid == uid && s.deviceID == deviceID && !s.isMultiplex() {
@@ -352,6 +358,39 @@ func (ss *SessionStore) EvictUserDevice(uid types.Uid, deviceID string) int {
 	return count
 }
 
+// EvictUserPlatform terminates all sessions of a given user in the same eviction
+// platform group, keeping the session identified by skipSid (e.g. the new login
+// which triggers the eviction). ios/android/mobile are treated as one mobile
+// group (顶号互踢); web only matches web.
+func (ss *SessionStore) EvictUserPlatform(uid types.Uid, platf, skipSid string, reason ...string) int {
+	ss.lock.Lock()
+	defer ss.lock.Unlock()
+
+	if uid.IsZero() || platf == "" {
+		return 0
+	}
+	evicted := NoErrEvicted("", "", types.TimeNow())
+	evicted.AsUser = uid.UserId()
+	if len(reason) > 0 && reason[0] != "" {
+		evicted.Ctrl.Params = map[string]any{"reason": reason[0]}
+	}
+	count := 0
+	for _, s := range ss.sessCache {
+		if s.uid == uid && sameEvictPlatform(s.platf, platf) && !s.isMultiplex() && s.sid != skipSid {
+			_, data := s.serialize(evicted)
+			s.stopSession(data)
+			delete(ss.sessCache, s.sid)
+			if s.proto == LPOLL {
+				ss.lru.Remove(s.lpTracker)
+			}
+			count++
+		}
+	}
+
+	statsSet("LiveSessions", int64(len(ss.sessCache)))
+	return count
+}
+
 // NodeRestarted removes stale sessions from a restarted cluster node.
 //   - nodeName is the name of affected node
 //   - fingerprint is the new fingerprint of the node.