Improve KB upload

web/services/backendApi.ts

@@ -611,12 +611,31 @@ export const deleteKnowledgeBase = async (kbId: string): Promise<void> => {
 };
 
 export const uploadKnowledgeDocument = async (kbId: string, file: File): Promise<void> => {
-  const payload = {
-    name: file.name,
-    size: `${(file.size / 1024).toFixed(1)} KB`,
-    fileType: file.type || 'txt',
-  };
-  await apiRequest(`/knowledge/bases/${kbId}/documents`, { method: 'POST', body: payload });
+  const formData = new FormData();
+  formData.append('file', file);
+  formData.append('name', file.name);
+  formData.append('size', `${file.size} bytes`);
+  formData.append('file_type', file.type || 'application/octet-stream');
+
+  const base = (import.meta.env.VITE_API_BASE_URL || 'http://127.0.0.1:8100/api').replace(/\/+$/, '');
+  const url = `${base}/knowledge/bases/${kbId}/documents`;
+  const response = await fetch(url, {
+    method: 'POST',
+    body: formData,
+  });
+
+  if (!response.ok) {
+    let message = `Upload failed: ${response.status}`;
+    try {
+      const data = await response.json();
+      if (data?.detail) {
+        message = typeof data.detail === 'string' ? data.detail : message;
+      }
+    } catch {
+      // ignore parse error
+    }
+    throw new Error(message);
+  }
 };
 
 export const deleteKnowledgeDocument = async (kbId: string, docId: string): Promise<void> => {