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

.githooks/pre-commit

@@ -0,0 +1,7 @@
+#!/bin/sh
+# Prevent .env files from being committed
+if git diff --cached --name-only | grep -E '\.env$|\.env\.'; then
+  echo "❌ ERROR: Attempting to commit .env file(s). This is blocked for security."
+  echo "   If you need to update .env.example, that's allowed."
+  exit 1
+fi