feat: SSH STCP key generation and frp tunnel registration

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/config.js

@@ -19,19 +19,33 @@ const DEFAULTS = {
   heartbeat_interval: 30,   // 秒
   /** 云端已激活：用于启动/重连时立即点亮 alarm（pwr），不等首包 connected */
   activated:          false,
+  ssh_secret_key:     null,
 };
 
+function _generateSshSecretKey() {
+  const bytes = require('crypto').randomBytes(16);
+  return 'sk-' + bytes.toString('hex');
+}
+
 function load() {
+  let cfg;
   try {
     if (fs.existsSync(CONFIG_FILE)) {
       const raw = fs.readFileSync(CONFIG_FILE, 'utf8');
-      return Object.assign({}, DEFAULTS, JSON.parse(raw));
+      cfg = Object.assign({}, DEFAULTS, JSON.parse(raw));
     }
   } catch (e) {
     const log = require('./logger');
     log.error('config', '读取配置失败，使用默认值:', e.message);
   }
-  return Object.assign({}, DEFAULTS);
+  if (!cfg) cfg = Object.assign({}, DEFAULTS);
+
+  if (!cfg.ssh_secret_key) {
+    cfg.ssh_secret_key = _generateSshSecretKey();
+    save(cfg);
+  }
+
+  return cfg;
 }
 
 function save(data) {