feat: 简化知识库导入——只输入NodeToken，自动获取标题和SpaceID

- admin_knowledge.py: /knowledge/import 改为单条导入，自动获取 title+space_id
- feishu_service.py: 新增 get_node_info() 公开方法
- App.vue: 简化 UI，只保留 NodeToken 输入框和导入按钮
- api.ts: 更新类型定义

ai_knowledge_base_v2/apps/admin-web/src/services/api.ts

@@ -106,8 +106,8 @@ export const api = {
   updateKnowledge: (id: number, payload: Record<string, unknown>) =>
     request<KnowledgeItem>(`/admin/knowledge/${id}`, { method: "PUT", body: JSON.stringify(payload) }),
   deleteKnowledge: (id: number) => request<null>(`/admin/knowledge/${id}`, { method: "DELETE" }),
-  importKnowledgeFromSpace: (body: Record<string, string>) =>
-    request<{ imported: number; skipped: number; nodes: { name: string; nodeToken: string; status: string; id?: number }[] }>(
+  importKnowledgeFromSpace: (body: { node_token: string }) =>
+    request<{ imported: number; skipped: number; id: number; name: string }>(
       "/admin/knowledge/import",
       { method: "POST", body: JSON.stringify(body) },
     ),