feat：替换 Dify 为自建 RAG去实现

1、修复了若干无权限时的失败提示语
2、新增了一个生成后续建议问题的功能
3、重构了知识问答部分的权限管理模块
4、修复了若干渲染不恰当的样式渲染

app/api/dify-chat/client.ts

@@ -241,9 +241,14 @@ export async function deleteConversation(id: string): Promise<{ result: string }
  * console.log('开场白:', opening_statement);
  * ```
  */
-export async function fetchAppParams(): Promise<AppParametersResponse> {
-    const url = `${API_URL}/parameters`;
-    console.log('⚙️ [Dify Client] 获取应用参数:', { url });
+export async function fetchAppParams(appId?: string): Promise<AppParametersResponse> {
+    const params = new URLSearchParams();
+    if (appId) {
+        params.append('app_id', appId);
+    }
+
+    const url = params.toString() ? `${API_URL}/parameters?${params}` : `${API_URL}/parameters`;
+    console.log('⚙️ [Dify Client] 获取应用参数:', { url, appId });
 
     try {
         const response = await axios.get<AppParametersResponse>(url, {