chore(dev): PM2 frontend PORT=3001 env + reviews/screenshots gitignore

- tasteby-web: PORT=3001 명시 (env 누락 → 기본 3000으로 충돌 위험)
- reviews/, screenshots/ 로컬 작업 산출물 무시

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -20,3 +20,7 @@ k8s/secrets.yaml
 backend/cookies.txt
 backend-java/cookies.txt
 **/cookies.txt
+
+# 작업 산출물 (로컬 전용)
+reviews/
+screenshots/

ecosystem.config.js

@@ -26,6 +26,7 @@ module.exports = {
       cwd: "/Users/joungmin/workspaces/tasteby/frontend",
       script: "npm",
       args: "run dev",
+      env: { PORT: 3001 },
     },
   ],
 };