chore(依赖): 删掉三个没用到的 vue-flow 插件，代码高亮全站只注册一份

- @vue-flow/minimap、node-resizer、node-toolbar 一处引用都没有
- App.vue 给 n-code 另建了一份 highlight.js，还注册着判题机早就不认的 Java、
  JavaScript、Go；改成空闲时加载 shared/highlight.ts 那份。62 条这三种语言的
  历史提交改为不上色显示

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/package.json

@@ -24,9 +24,6 @@
     "@vue-flow/background": "^1.3.2",
     "@vue-flow/controls": "^1.1.3",
     "@vue-flow/core": "^1.48.2",
-    "@vue-flow/minimap": "^1.5.4",
-    "@vue-flow/node-resizer": "^1.5.1",
-    "@vue-flow/node-toolbar": "^1.1.1",
     "@vueuse/core": "^15.0.0",
     "@vueuse/router": "^15.0.0",
     "@wangeditor-next/editor": "^6.5.0",