feat(iter-v2): T01 complete - security + infrastructure

- S1: .githooks/pre-commit blocks .env commits, .env.test in .gitignore
- S3: TOKEN_SECRET centralized to config/token.ts, all files import from it
- S3: checkTokenSecret enforces min 32-char TOKEN_SECRET at startup
- S5: Refresh Token mechanism (Access 2h + Refresh 30d, dual token)
- S5: POST /auth/refresh endpoint with rotation and max 5 per user
- S5: Frontend request.ts auto-refresh on 40101, concurrent-safe
- S6: Soft delete (deleted_at column), admin soft-delete with confirmName
- S6: POST /admin/users/:id/restore endpoint
- S6: All user queries filter deleted_at IS NULL
- S7: DB connection requires env vars, no fallback credentials
- Infra: jest.config.js, vitest.config.ts, .env.test
- Infra: node-cron, jest, ts-jest, supertest, vitest, @pinia/testing

server/src/routes/backup.ts

@@ -3,12 +3,12 @@ import { AuthRequest } from '../middleware/auth'
 import { backupDatabase, getBackupList } from '../utils/backup'
 import { requireAdmin } from '../middleware/requireAdmin'
 import { createHmac } from 'crypto'
+import { TOKEN_SECRET } from '../config/token'
 import fs from 'fs'
 import path from 'path'
 
 const router = Router()
 const BACKUP_DIR = process.env.BACKUP_DIR || '/var/backups/xiaocai'
-const TOKEN_SECRET = process.env.TOKEN_SECRET || 'xiaocai-token-secret-change-in-production'
 
 // 所有路由都需要管理员权限（除了 :id/download 使用签名校验）
 router.use((req, res, next) => {