f/rebuild: 公開ページをフロントへ移譲・統計公開・k3s 向け設定外部化

[Uno-Takashi]

React フロントエンド移行のバックエンド側（f/rebuild 作業を含む）。

変更

• 移行済みページ（LP / 使い方 / ロビー）の Django テンプレート・ビューを削除。web/urls.py は /admin/chart（管理者向け統計）のみ。
• AnimeStoreLobbyResolveAPI（GET /api/v1/anime-store/lobby/<uuid>）を追加。フロントのロビーが room_id → dアニメストア リダイレクト URL を解決。
• 統計系 8 エンドポイントを公開（AllowAny）。公開 /stats ページ用。
• nginx: 公開ページ→フロント、/api・/admin・/metrics・WebSocket（/anime-store/party/）→ Django に振り分け。/api はローカル用 CORS 付き。
• docker-compose: frontend サービス追加。
• サービス解決先を env 化（.env.global: DJANGO_UPSTREAM/FRONTEND_UPSTREAM/GRAFANA_UPSTREAM）— k3s 移行を見据えた設定外部化。
• 進行中の rebuild 変更（settings・依存・docs）を含む。

検証: ruff check / format パス。Django ランタイム check は環境都合で未実行（uv run python manage.py check 推奨）。

🤖 Generated with Claude Code

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

actionlint

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🚫 [actionlint] _{reported by reviewdog 🐶}
the runner of "actions/setup-python@v3" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]

https://github.com/d-party/d-party-Backend/blob/e8ecde3978f5f6c1138a1a931028d012fef9ac74/.github/workflows/security.yml#L13

---

🚫 [actionlint] _{reported by reviewdog 🐶}
the runner of "actions/checkout@v3" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]

https://github.com/d-party/d-party-Backend/blob/e8ecde3978f5f6c1138a1a931028d012fef9ac74/.github/workflows/security.yml#L19

---

🚫 [actionlint] _{reported by reviewdog 🐶}
the runner of "actions/upload-artifact@v2" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]

https://github.com/d-party/d-party-Backend/blob/e8ecde3978f5f6c1138a1a931028d012fef9ac74/.github/workflows/security.yml#L25

---

🚫 [actionlint] _{reported by reviewdog 🐶}
the runner of "actions/setup-python@v3" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]

https://github.com/d-party/d-party-Backend/blob/e8ecde3978f5f6c1138a1a931028d012fef9ac74/.github/workflows/security.yml#L36

---

🚫 [actionlint] _{reported by reviewdog 🐶}
the runner of "actions/checkout@v3" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]

https://github.com/d-party/d-party-Backend/blob/e8ecde3978f5f6c1138a1a931028d012fef9ac74/.github/workflows/security.yml#L42

---

🚫 [actionlint] _{reported by reviewdog 🐶}
the runner of "actions/upload-artifact@v2" action is too old to run on GitHub Actions. update the action's version to fix this issue [action]

https://github.com/d-party/d-party-Backend/blob/e8ecde3978f5f6c1138a1a931028d012fef9ac74/.github/workflows/security.yml#L48

[github-actions]

🚫 [mypy] _{reported by reviewdog 🐶}
No parent module -- cannot perform relative import