fix: 知识库文档上传(尾斜杠+FormData+真文件接收); AI回复强制Markdown; 平台全功能知识库注入系统提示

frontend/src/api/index.ts

@@ -261,7 +261,7 @@ export const knowledgeAPI = {
 
   getDocument: (baseId: string, docId: string) => get<any>(`/knowledge/bases/${baseId}/documents/${docId}`),
 
-  uploadDocument: (baseId: string, data: any) => post<any>(`/knowledge/bases/${baseId}/documents/`, data),
+  uploadDocument: (baseId: string, data: any) => post<any>(`/knowledge/bases/${baseId}/documents`, data),
 
   deleteDocument: (baseId: string, docId: string) => del<any>(`/knowledge/bases/${baseId}/documents/${docId}`),