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/realtime_dispatcher.go

@@ -19,6 +19,7 @@ const (
 	realtimeTargetTopic  = "topic"
 	realtimeTargetUser   = "user"
 	realtimeTargetDevice = "device"
+	realtimeTargetPlatf  = "platform"
 )
 
 func startRedisRealtimeFanout(ctx context.Context) {
@@ -105,6 +106,45 @@ func publishRealtimeEvictDevice(tenantID types.TenantID, uid types.Uid, deviceID
 	immetrics.IncRealtimeFanout("publish", realtimeKindSessionControl, realtimeTargetDevice, "ok")
 }
 
+// publishRealtimeEvictUserPlatform evicts all sessions of the user on the given
+// platform across cluster nodes. skipSid (the new login session) is part of the
+// dedup key because repeated logins on the same platform within the dedup window
+// must each reach the subscriber nodes.
+func publishRealtimeEvictUserPlatform(tenantID types.TenantID, uid types.Uid, platf, reason, skipSid string) {
+	if !tenantID.IsValid() || uid.IsZero() || strings.TrimSpace(platf) == "" {
+		immetrics.IncRealtimeFanout("publish", realtimeKindSessionControl, realtimeTargetPlatf, "skip_invalid")
+		return
+	}
+	msg := NoErrEvicted("", "", types.TimeNow())
+	msg.TenantID = tenantID
+	msg.AsUser = uid.UserId()
+	if reason != "" {
+		msg.Ctrl.Params = map[string]any{"reason": reason}
+	}
+	target := uid.UserId() + ":" + strings.TrimSpace(platf)
+	dedupKey := "evict:platform:" + target + ":" + skipSid
+	if err := store.PublishRealtimeFanout(currentNodeID(), tenantID, realtimeKindSessionControl, realtimeTargetPlatf, target, skipSid, dedupKey, msg); err != nil {
+		immetrics.IncRealtimeFanout("publish", realtimeKindSessionControl, realtimeTargetPlatf, "error")
+		logs.Warn.Printf("redis realtime fanout: publish evict platform=%s failed: %v", target, err)
+		return
+	}
+	immetrics.IncRealtimeFanout("publish", realtimeKindSessionControl, realtimeTargetPlatf, "ok")
+}
+
+// fanoutEvictReason extracts the machine-readable eviction reason from a
+// session-control fanout message, if present.
+func fanoutEvictReason(msg *ServerComMessage) string {
+	if msg == nil || msg.Ctrl == nil {
+		return ""
+	}
+	params, ok := msg.Ctrl.Params.(map[string]any)
+	if !ok {
+		return ""
+	}
+	reason, _ := params["reason"].(string)
+	return reason
+}
+
 func deliverRealtimeFanoutEnvelope(envelope *store.RealtimeFanoutEnvelope) {
 	if envelope == nil || !envelope.TenantID.IsValid() || len(envelope.Message) == 0 {
 		immetrics.IncRealtimeFanout("receive", realtimeKindMessage, realtimeTargetTopic, "skip_invalid")
@@ -195,7 +235,15 @@ func deliverRealtimeSessionControl(envelope *store.RealtimeFanoutEnvelope, msg *
 			immetrics.IncRealtimeFanout("deliver", envelope.Kind, envelope.TargetType, "skip_invalid_target")
 			return
 		}
-		globals.sessionStore.EvictUserDevice(types.ParseUserId(uidText), deviceID)
+		globals.sessionStore.EvictUserDevice(types.ParseUserId(uidText), deviceID, fanoutEvictReason(msg))
+		immetrics.IncRealtimeFanout("deliver", envelope.Kind, envelope.TargetType, "evicted")
+	case realtimeTargetPlatf:
+		uidText, platf, ok := strings.Cut(envelope.Target, ":")
+		if !ok {
+			immetrics.IncRealtimeFanout("deliver", envelope.Kind, envelope.TargetType, "skip_invalid_target")
+			return
+		}
+		globals.sessionStore.EvictUserPlatform(types.ParseUserId(uidText), platf, envelope.SkipSid, fanoutEvictReason(msg))
 		immetrics.IncRealtimeFanout("deliver", envelope.Kind, envelope.TargetType, "evicted")
 	case realtimeTargetUser:
 		uid := types.ParseUserId(envelope.Target)
@@ -203,7 +251,7 @@ func deliverRealtimeSessionControl(envelope *store.RealtimeFanoutEnvelope, msg *
 			immetrics.IncRealtimeFanout("deliver", envelope.Kind, envelope.TargetType, "skip_invalid_target")
 			return
 		}
-		globals.sessionStore.EvictUser(uid, envelope.SkipSid)
+		globals.sessionStore.EvictUser(uid, envelope.SkipSid, fanoutEvictReason(msg))
 		immetrics.IncRealtimeFanout("deliver", envelope.Kind, envelope.TargetType, "evicted")
 	}
 	_ = msg