feat: DevTools 数据库监看面板 + 隧道控制 + 多项 Bug 修复

**DevTools 新增功能 (Tasks 13-14):**
- 首页仪表盘添加数据库实时监看卡片 (5端口状态 + 记忆数)
- 侧边栏新增数据库面板，支持自动 5 秒刷新
- 数据库面板显示 PostgreSQL/Redis/Qdrant/MinIO/NATS 端口状态
- 隧道控制按钮 (启动/停止/重启/查看状态)
- 新增 API 端点: GET /api/database/status, POST /api/tunnel/:action
- 更新 docs/api-reference/ API 文档

**Bug 修复 (Task 15):**
- 修复 pgrep -f 自匹配导致隧道状态误判 (添加 ^ssh 锚点)
  - devtools/src/index.js (dashboard + database/status)
  - scripts/tunnel.sh (is_tunnel_running + show_status)
- 修复数据库面板缺少自动刷新定时器
- 修复侧边栏数据库徽章永远 display:none
- 修复僵尸进程场景下按钮死锁问题

**其他改进:**
- .gitignore 添加 backend/cmd, backend/iot-debug-service/main
- 前端多项改进 (登录/注册/会话/流式动画等)

devtools/src/config.js

@@ -24,6 +24,8 @@ export const SERVICES = {
     env: {
       AI_CORE_PORT: '8081',
       PERSONA_DIR: './internal/persona',
+      IOT_DEBUG_SERVICE_URL: process.env.IOT_DEBUG_SERVICE_URL || 'http://localhost:8083',
+      ENABLE_BACKGROUND_THINKING: process.env.ENABLE_BACKGROUND_THINKING || 'true',
     },
     healthUrl: 'http://localhost:8081/api/v1/health',
     port: 8081,
@@ -31,6 +33,19 @@ export const SERVICES = {
     buildArgs: ['build', '-o', 'main', './cmd/main.go'],
     goBin: '/usr/local/go/bin/go',
   },
+  'iot-debug-service': {
+    name: 'IoT Debug',
+    cwd: path.join(ROOT, 'backend/iot-debug-service'),
+    command: './main',
+    env: {
+      IOT_DEBUG_PORT: '8083',
+    },
+    healthUrl: 'http://localhost:8083/api/v1/health',
+    port: 8083,
+    buildCommand: 'go',
+    buildArgs: ['build', '-o', 'main', './cmd/main.go'],
+    goBin: '/usr/local/go/bin/go',
+  },
   gateway: {
     name: 'Gateway',
     cwd: path.join(ROOT, 'backend/gateway'),
@@ -41,7 +56,7 @@ export const SERVICES = {
       AI_CORE_URL: 'http://localhost:8081',
       ADMIN_USERNAME: process.env.ADMIN_USERNAME || 'admin',
       ADMIN_PASSWORD: process.env.ADMIN_PASSWORD || 'cyrene-dev-admin',
-      REGISTRATION_ENABLED: process.env.REGISTRATION_ENABLED || 'false',
+      REGISTRATION_ENABLED: process.env.REGISTRATION_ENABLED || 'true',
     },
     healthUrl: 'http://localhost:8080/api/v1/health',
     port: 8080,