refactor(guide): 重构教程文档页面结构和布局

- 将 ProviderGuide/ModelGuide/UserKeyGuide 替换为 ArchitectureGuide/ConceptsGuide/StrategyGuide
- GuideLayout 迁移至 AppShell 组件，统一侧边栏导航和移动端菜单
- Overview 页面重写内容结构
- 更新路由配置和导航配置项
- homeGuard 添加 /guide 路径支持

frontend/src/router/guards/homeGuard.ts

@@ -20,7 +20,7 @@ export function resolveHomeRedirect(
 
   // 已登录用户如果是从dashboard返回首页、刷新首页、或者有returnTo参数,允许访问首页
   const isFromApp =
-    from.path.startsWith('/dashboard') || from.path.startsWith('/admin') || from.path === '/'
+    from.path.startsWith('/dashboard') || from.path.startsWith('/admin') || from.path.startsWith('/guide') || from.path === '/'
   if (to.query.returnTo || isFromApp) {
     return ''
   }

frontend/src/router/index.ts

@@ -31,21 +31,21 @@ const routes: RouteRecordRaw[] = [
         meta: { requiresAuth: false }
       },
       {
-        path: 'provider',
-        name: 'GuideProvider',
-        component: () => importWithRetry(() => import('@/views/public/guide/ProviderGuide.vue')),
+        path: 'architecture',
+        name: 'GuideArchitecture',
+        component: () => importWithRetry(() => import('@/views/public/guide/ArchitectureGuide.vue')),
         meta: { requiresAuth: false }
       },
       {
-        path: 'model',
-        name: 'GuideModel',
-        component: () => importWithRetry(() => import('@/views/public/guide/ModelGuide.vue')),
+        path: 'concepts',
+        name: 'GuideConcepts',
+        component: () => importWithRetry(() => import('@/views/public/guide/ConceptsGuide.vue')),
         meta: { requiresAuth: false }
       },
       {
-        path: 'user-key',
-        name: 'GuideUserKey',
-        component: () => importWithRetry(() => import('@/views/public/guide/UserKeyGuide.vue')),
+        path: 'strategy',
+        name: 'GuideStrategy',
+        component: () => importWithRetry(() => import('@/views/public/guide/StrategyGuide.vue')),
         meta: { requiresAuth: false }
       },
       {