新增: 依赖关系图(AntV X6 v3 + Vue 自定义节点)

- DependencyGraph.vue: X6 画布初始化 + 插件(框选/对齐线/撤销/滚动) + 工程节点渲染
- ModuleNode.vue: Vue 自定义节点组件(工程名/路径/技术栈标签)
- 项目详情新增依赖图Tab,与概览/文件并列
- 网格布局排列工程节点,支持缩放/拖拽/框选
- Phase 0 验证 demo(X6Demo.vue)保留在 /dev/x6 路由

package.json

@@ -13,12 +13,15 @@
     "build:dev": "tauri build --debug --no-bundle"
   },
   "dependencies": {
+    "@antv/x6": "^3.1.7",
+    "@antv/x6-vue-shape": "^3.0.2",
     "@arco-design/web-vue": "^2.58.0",
     "@tauri-apps/api": "^2",
     "@tauri-apps/plugin-dialog": "^2.7.1",
     "dompurify": "^3.4.10",
     "highlight.js": "^11.11.1",
     "marked": "^18.0.5",
+    "tslib": "^2.8.1",
     "vue": "^3.5.13",
     "vue-i18n": "9",
     "vue-router": "4"