feat: 知识图谱视图改用 markmap（消费文件树渲染 XMind 思维导图，移除 @antv/g6）

apps/desktop/package.json

@@ -10,7 +10,6 @@
     "typecheck": "tsc -b"
   },
   "dependencies": {
-    "@antv/g6": "^5.1.1",
     "@hunter/shared": "workspace:*",
     "@tiptap/core": "^3.30.2",
     "@tiptap/extension-character-count": "^3.30.2",
@@ -30,6 +29,7 @@
     "@tiptap/suggestion": "^3.30.2",
     "hotkeys-js": "^4.0.5",
     "lowlight": "^3.3.0",
+    "markmap-view": "^0.18.12",
     "remark-gfm": "^4.0.1",
     "remark-math": "^6.0.0",
     "remark-parse": "^11.0.0",