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.$id.tsx

@@ -0,0 +1,76 @@
+/**
+ * PUT /api/v3/dify/area-datasets/{id} - 更新知识库绑定
+ * DELETE /api/v3/dify/area-datasets/{id} - 删除知识库绑定
+ */
+
+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';
+
+export async function loader({ request, params }: LoaderFunctionArgs) {
+    return json({ error: 'Method not allowed' }, { status: 405 });
+}
+
+/**
+ * 更新知识库绑定
+ */
+export async function action({ request, params }: 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 { id } = params;
+        const method = request.method;
+
+        if (method === 'PUT') {
+            // 更新知识库绑定
+            const body = await request.json();
+            console.log(`[API V3] Update Area Dataset: ${id}`, body);
+
+            const apiUrl = `${API_BASE_URL}/v3/dify/area-datasets/${id}`;
+            const response = await backendRequest(apiUrl, {
+                method: 'PUT',
+                headers: {
+                    Authorization: `Bearer ${frontendJWT}`,
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify(body),
+            });
+
+            const data = await response.json();
+            return json(data, { status: response.status });
+
+        } else if (method === 'DELETE') {
+            // 删除知识库绑定
+            console.log(`[API V3] Delete Area Dataset: ${id}`);
+
+            const apiUrl = `${API_BASE_URL}/v3/dify/area-datasets/${id}`;
+            const response = await backendRequest(apiUrl, {
+                method: 'DELETE',
+                headers: {
+                    Authorization: `Bearer ${frontendJWT}`,
+                },
+            });
+
+            const data = await response.json();
+            return json(data, { status: response.status });
+
+        } else {
+            return json({ error: 'Method not allowed' }, { status: 405 });
+        }
+
+    } catch (error: any) {
+        console.error('[API V3] Area Dataset Action - Error:', error.message);
+        return json(
+            { error: error.message || 'Operation failed' },
+            { status: 500 }
+        );
+    }
+}