feat: 添加知识库配置管理功能

新增地区-知识库绑定管理功能，支持增删改查操作
- 添加 V3 API 路由层：area-datasets 相关接口
- 添加 API 客户端：area-datasets.ts
- 添加自定义 Hook：use-area-dataset-config.ts
- 添加管理组件：area-dataset-config.tsx
- 修复路由冲突问题，删除重复的 .ts 路由文件
- 更新 dataset-manager 页面，添加 Tabs 导航

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/routes/api.v3.dify.area-datasets.tsx

@@ -0,0 +1,100 @@
+/**
+ * GET /api/v3/dify/area-datasets - 获取所有知识库绑定列表（管理员）
+ * POST /api/v3/dify/area-datasets - 创建知识库绑定
+ */
+
+import { type LoaderFunctionArgs, json } from '@remix-run/node';
+import { API_BASE_URL } from '~/config/api-config';
+import { getUserSession } from '~/api/login/auth.server';
+import { request as backendRequest } from '~/api/axios-client';
+
+/**
+ * GET - 获取所有知识库绑定列表
+ */
+export async function loader({ request }: LoaderFunctionArgs) {
+    try {
+        const { frontendJWT } = await getUserSession(request);
+
+        if (!frontendJWT) {
+            return new Response(
+                JSON.stringify({ error: 'JWT认证失败，请重新登录' }),
+                { status: 401, headers: { 'Content-Type': 'application/json' } }
+            );
+        }
+
+        // 获取查询参数
+        const url = new URL(request.url);
+        const area = url.searchParams.get('area');
+        const only_enabled = url.searchParams.get('only_enabled');
+        const page = url.searchParams.get('page') || '1';
+        const page_size = url.searchParams.get('page_size') || '20';
+
+        // 构建查询参数
+        const params = new URLSearchParams();
+        if (area) params.append('area', area);
+        if (only_enabled !== null) params.append('only_enabled', only_enabled);
+        params.append('page', page);
+        params.append('page_size', page_size);
+
+        console.log('[API V3] Get All Area Datasets', { area, only_enabled, page, page_size });
+
+        // 转发请求到后端
+        const apiUrl = `${API_BASE_URL}/v3/dify/area-datasets?${params}`;
+        const response = await backendRequest(apiUrl, {
+            method: 'GET',
+            headers: {
+                Authorization: `Bearer ${frontendJWT}`,
+            },
+        });
+
+        const data = await response.json();
+        return json(data, { status: response.status });
+
+    } catch (error: any) {
+        console.error('[API V3] Get All Area Datasets - Error:', error.message);
+        return json(
+            { error: error.message || 'Failed to get all area datasets' },
+            { status: 500 }
+        );
+    }
+}
+
+/**
+ * POST - 创建知识库绑定
+ */
+export async function action({ request }: LoaderFunctionArgs) {
+    try {
+        const { frontendJWT } = await getUserSession(request);
+
+        if (!frontendJWT) {
+            return new Response(
+                JSON.stringify({ error: 'JWT认证失败，请重新登录' }),
+                { status: 401, headers: { 'Content-Type': 'application/json' } }
+            );
+        }
+
+        const body = await request.json();
+        console.log('[API V3] Create Area Dataset', body);
+
+        // 转发创建请求到后端
+        const apiUrl = `${API_BASE_URL}/v3/dify/area-datasets`;
+        const response = await backendRequest(apiUrl, {
+            method: 'POST',
+            headers: {
+                Authorization: `Bearer ${frontendJWT}`,
+                'Content-Type': 'application/json',
+            },
+            body: JSON.stringify(body),
+        });
+
+        const data = await response.json();
+        return json(data, { status: response.status });
+
+    } catch (error: any) {
+        console.error('[API V3] Create Area Dataset - Error:', error.message);
+        return json(
+            { error: error.message || 'Failed to create area dataset' },
+            { status: 500 }
+        );
+    }
+}