新增源码绑定、代码面板、流程分组可视化与分组模式切换

- Web: 点击节点在底部代码面板展示源码（语法高亮、可折叠）
- Web: 画布按目录/文件聚类为背景框，头部新增分组模式切换（目录/文件/无）
- Web: 流程横幅、流程/分组列表与节点详情展示 summary
- CLI: 新增 overview 推导与运行器
- scripts: 手动标注 self-report summary

Co-authored-by: Cursor <cursoragent@cursor.com>

web/package.json

@@ -10,11 +10,13 @@
   },
   "dependencies": {
     "@dagrejs/dagre": "^1.1.4",
+    "@types/react-syntax-highlighter": "^15.5.13",
     "@xyflow/react": "^12.3.5",
     "mobx": "^6.13.5",
     "mobx-react-lite": "^4.0.7",
     "react": "^19.0.0",
-    "react-dom": "^19.0.0"
+    "react-dom": "^19.0.0",
+    "react-syntax-highlighter": "^16.1.1"
   },
   "devDependencies": {
     "@types/react": "^19.0.0",