3x-ui 式共享节点改造：nodes 状态机 + nodeClients 各自凭据

- 移除 VMess 协议
- VLESS/SS2022 按用户流量统计（AnyTLS 日志解析，SS 节点级）
- sing-box v2ray_api stats 支持
- 内存优化：面板 128M，agent 64M，sing-box 64M

lib/store.js

@@ -4,8 +4,8 @@ const fs = require('node:fs');
 const path = require('node:path');
 
 const COLLECTIONS = [
-  'users', 'servers', 'agents', 'enrollmentTokens', 'customers', 'chains',
-  'deployments', 'jobs', 'activity', 'observations', 'subscriptionAccess', 'subscriptionClients'
+  'users', 'servers', 'agents', 'enrollmentTokens', 'customers', 'nodes',
+  'nodeClients', 'jobs', 'activity', 'observations', 'subscriptionAccess', 'subscriptionClients'
 ];
 
 function emptyData() {
@@ -20,7 +20,7 @@ function emptyData() {
       completedJobRetentionDays: 7
     },
     users: [], servers: [], agents: [], enrollmentTokens: [], customers: [],
-    chains: [], deployments: [], jobs: [], activity: [], observations: [], subscriptionAccess: [], subscriptionClients: []
+    nodes: [], nodeClients: [], jobs: [], activity: [], observations: [], subscriptionAccess: [], subscriptionClients: []
   };
 }