feat: QA test suite (12 stages, 205 tests) + Chrome DevTools MCP config

- Add tests/ directory with 12 bash/curl/jq test stages covering all API endpoints
- Add tests/lib/common.sh shared library with assertions and helpers
- Add tests/run-all.sh orchestrator script
- Update CLAUDE.md with test data reference and DevTools MCP docs
- Increase dev rate limit to 5000 for test suite runs
- Configure Chrome DevTools MCP in project settings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/index.ts

@@ -49,7 +49,7 @@ app.use('/api/rental-payments/webhook', express.raw({ type: 'application/json' }
 app.use(express.json());
 
 // Rate limiting
-const authLimiter = rateLimit({ windowMs: 15 * 60 * 1000, max: 50 });
+const authLimiter = rateLimit({ windowMs: 15 * 60 * 1000, max: env.NODE_ENV === 'production' ? 50 : 5000 });
 app.use('/api/auth/login', authLimiter);
 app.use('/api/auth/register', authLimiter);