chore: ブートログ充実・開発起動安定化・ルール追加 ...

- ブートシーケンスに [BOOT] フェーズと経過時間を追加 (lib.rs, mcp/mod.rs, mcp/system.rs)
- MCP 受信ログを 'MCP receive' に変更（文字化け防止）
- 開発時: beforeDevCommand + devUrl でフロントサーバーを先起動しタイムアウトを回避
- package.json に dev:frontend スクリプト追加
- ルール追加: コミットする前にジャーナルを書くこと
- ジャーナル: journals/20260304-0001-ブートログと開発起動の改善.md

Made-with: Cursor

Issue edit and 404 handling implemented.

modified: .agent/rules/issue_management.md ...

modified:   tools/scripts/sync_issues.mjs

設定の永続化（Tauri invoke優先）とサーバー受信ログ出力を追加 ...

Made-with: Cursor

refactor: Split mcp.rs into functional modules and sub-tools

docs: remove Japanese duplicate journal (keep ASCII copy)

docs: reformat bilingual documents into separate blocks ...

- Reorganized Issue-2 journal, Issue Management rules, and Development Guide.
- Separated Japanese and English descriptions into distinct blocks for better readability.
- Issue-2.md (local sync file) was also updated but is excluded from git track.

docs: relocate rules to .agent/rules and make them bilingual ...

- Moved issue management and development guide to .agent/rules.
- Added English translations to all operational rules.
- Cleaned up obsolete files in docs/.

サイドカー自動起動・監視、llama_server状態API、UI連携、ESLint/Prettier整備、journal追加