feat: 实现知识库前端界面（英文国际化）

- 添加知识库 V2 完整英文翻译文件
- 包括：主页、文档管理、检索测试、全局设置、会话配置
- 在 Alkaid 导航中添加 "Native Knowledge Base" 入口
- 区分 "Native Knowledge Base" 和 "Knowledge Base (Plugin)"

dashboard/src/router/MainRoutes.ts

@@ -89,9 +89,31 @@ const MainRoutes = {
     //   ]
     // },
     {
-      name: 'KnowledgeBase',
-      path: '/alkaid/knowledge-base',
-      component: () => import('@/views/alkaid/KnowledgeBase.vue')
+      name: 'Alkaid',
+      path: '/alkaid',
+      component: () => import('@/views/AlkaidPage.vue'),
+      children: [
+        {
+          path: 'knowledge-base-v2',
+          name: 'KnowledgeBaseV2',
+          component: () => import('@/views/alkaid/knowledge-base-v2/KnowledgeBaseV2.vue')
+        },
+        {
+          path: 'knowledge-base',
+          name: 'KnowledgeBase',
+          component: () => import('@/views/alkaid/KnowledgeBase.vue')
+        },
+        {
+          path: 'long-term-memory',
+          name: 'LongTermMemory',
+          component: () => import('@/views/alkaid/LongTermMemory.vue')
+        },
+        {
+          path: 'other',
+          name: 'OtherFeatures',
+          component: () => import('@/views/alkaid/Other.vue')
+        }
+      ]
     },
     {
       name: 'Chat',