feat: 新增键盘快捷键设置

- 设置页新增「键盘快捷键」分类，可自定义快捷键绑定
- 支持快速滚动（Home/End/PageUp/PageDown）与导航跳转（Ctrl/Cmd+数字）
- 快捷键绑定与开关按动作独立持久化，默认关闭
- 新增 ui 包 keybinding 组件与工具（KeybindingModal/KeybindingChips 等）

apps/app-frontend/src/App.vue

@@ -169,6 +169,7 @@ import { createServerInstall, provideServerInstall } from '@/providers/server-in
 import { setupProviders } from '@/providers/setup'
 import { setupAuthProvider } from '@/providers/setup/auth'
 import { setupLoadingStateProvider } from '@/providers/setup/loading-state'
+import { setupKeyboardShortcuts } from '@/composables/useKeyboardShortcuts'
 import { useError } from '@/store/error.js'
 import { useTheming } from '@/store/state'
 
@@ -184,6 +185,8 @@ const onSchematicWorkshopPage = computed(() => route.path === '/lab/schematic-pr
 const isSchematicFile = (path: string) => /\.(litematic|schematic|schem)$/i.test(path)
 const APP_LEFT_NAV_WIDTH = '4rem'
 
+setupKeyboardShortcuts()
+
 const discoverContentPath = computed(() => {
 	const projectType = route.params.projectType
 	if (