backend/frontend/runtime: 训练面板 / session 隔离 / agent runtime 调整

- backend/api/server.py：训练 step-detail / pipeline 卡片排序逻辑
- frontend：thread-list / thread / training-pipeline-panel / step-detail-sheet 配套调整，新增 metrics-chart-panel
- src/agent_*：tool spec / runtime / prompting 配套
- .gitignore 加 .logs/

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

frontend/app/package.json

@@ -31,6 +31,7 @@
 		"react": "^19.2.5",
 		"react-dom": "^19.2.5",
 		"react-markdown": "^10.1.0",
+		"recharts": "^2.15.4",
 		"remark-gfm": "^4.0.1",
 		"tailwind-merge": "^3.5.0",
 		"tw-animate-css": "^1.4.0",