feat: 支持输入框内选择知识库和文件，优化选择交互体验

frontend/src/api/chat/streame.ts

@@ -28,7 +28,7 @@ export function useStream() {
   let renderTimer: number | null = null
 
   // 启动流式请求
-  const startStream = async (params: { session_id: any; query: any; knowledge_base_ids?: string[]; agent_enabled?: boolean; web_search_enabled?: boolean; summary_model_id?: string; mcp_service_ids?: string[]; method: string; url: string }) => {
+  const startStream = async (params: { session_id: any; query: any; knowledge_base_ids?: string[]; knowledge_ids?: string[]; agent_enabled?: boolean; web_search_enabled?: boolean; summary_model_id?: string; mcp_service_ids?: string[]; method: string; url: string }) => {
     // 重置状态
     output.value = '';
     error.value = null;
@@ -85,6 +85,10 @@ export function useStream() {
       if (params.knowledge_base_ids !== undefined && params.knowledge_base_ids.length > 0) {
         postBody.knowledge_base_ids = params.knowledge_base_ids;
       }
+      // Include knowledge_ids if provided
+      if (params.knowledge_ids !== undefined && params.knowledge_ids.length > 0) {
+        postBody.knowledge_ids = params.knowledge_ids;
+      }
       // Include web_search_enabled if provided
       if (params.web_search_enabled !== undefined) {
         postBody.web_search_enabled = params.web_search_enabled;

frontend/src/api/knowledge-base/index.ts

@@ -230,4 +230,8 @@ export interface FAQImportProgress {
 
 export function getFAQImportProgress(taskId: string) {
   return get(`/api/v1/faq/import/progress/${taskId}`);
-}
+}
+
+export function searchKnowledge(keyword: string, offset = 0, limit = 20) {
+  return get(`/api/v1/knowledge/search?keyword=${encodeURIComponent(keyword)}&offset=${offset}&limit=${limit}`);
+}