feat(knowledge-base): 添加知识库文件全库检索功能

- 新增相对路径字段替代原有的metadata存储方式
- 实现跨知识库文件检索接口searchFiles
- 添加前端全库检索页面和相关API调用
- 优化文件路径处理和数据库索引配置
- 统一请求参数类型定义为RequestPayload和RequestParams
- 简化RagFile模型中的元数据结构设计

frontend/src/routes/routes.ts

@@ -30,6 +30,7 @@ import ManualEvaluatePage from "@/pages/DataEvaluation/Evaluate/ManualEvaluate";
 import KnowledgeBasePage from "@/pages/KnowledgeBase/Home/KnowledgeBasePage";
 import KnowledgeBaseDetailPage from "@/pages/KnowledgeBase/Detail/KnowledgeBaseDetail";
 import KnowledgeBaseFileDetailPage from "@/pages/KnowledgeBase/FileDetail/KnowledgeBaseFileDetail";
+import KnowledgeBaseSearch from "@/pages/KnowledgeBase/Search/KnowledgeBaseSearch";
 
 import OperatorMarketPage from "@/pages/OperatorMarket/Home/OperatorMarket";
 import OperatorPluginCreate from "@/pages/OperatorMarket/Create/OperatorPluginCreate";
@@ -246,6 +247,10 @@ const router = createBrowserRouter([
             index: true,
             Component: KnowledgeBasePage,
           },
+          {
+            path: "search",
+            Component: KnowledgeBaseSearch,
+          },
           {
             path: "detail/:id",
             Component: KnowledgeBaseDetailPage,