feat: DevTools综合升级 — 记忆查询 + 会话监看 + WebUI侧边栏重构

- docs: 17个文件重命名为 YYYY-MM-DD.HH-mm-SS-内容.md 格式
- config: 管理员凭据移至 backend/.env (ADMIN_USERNAME/PASSWORD)
- gateway: 新增 SessionState 会话追踪 + GET /api/v1/admin/sessions
- devtools: 新增7个代理端点 (dashboard/sessions/memory)
- devtools: WebUI重构为侧边栏 + 5面板 (仪表盘/记忆/会话/服务/性能)

devtools/src/config.js

@@ -12,6 +12,9 @@ const ROOT = path.resolve(__dirname, '../..');
 
 export const DEVTOOLS_PORT = process.env.DEVTOOLS_PORT || 9090;
 export const LOGS_DIR = path.resolve(__dirname, '../logs');
+export const GATEWAY_URL = process.env.GATEWAY_URL || 'http://localhost:8080';
+export const ADMIN_USERNAME = process.env.ADMIN_USERNAME || 'admin';
+export const ADMIN_PASSWORD = process.env.ADMIN_PASSWORD || 'cyrene-dev-admin';
 
 export const SERVICES = {
   'ai-core': {
@@ -20,9 +23,6 @@ export const SERVICES = {
     command: './main',
     env: {
       AI_CORE_PORT: '8081',
-      LLM_API_URL: process.env.LLM_API_URL || 'https://api.openai.com/v1',
-      LLM_API_KEY: process.env.LLM_API_KEY || '',
-      LLM_MODEL: process.env.LLM_MODEL || 'gpt-4o',
       PERSONA_DIR: './internal/persona',
     },
     healthUrl: 'http://localhost:8081/api/v1/health',