feat: upload form shows name for auth groups, file input with media type validation

- get_org_groups.dspy: show name if available, fallback to vendor_group_id
- upload_asset.ui: change source_url from text textarea to file input (accept image/audio/video)
- rl_upload.dspy: auto-detect asset_type from file extension, server-side media type validation

wwwroot/api/get_org_groups.dspy

@@ -8,8 +8,10 @@ rows = []
 for g in groups:
     vid = g.get('vendor_group_id', '')
     vendor = g.get('vendor', '')
+    name = g.get('name', '')
     if vid:
-        rows.append({"value": vid, "text": f"{vendor} - {vid}"})
+        display = f"{vendor} - {name}" if name else f"{vendor} - {vid}"
+        rows.append({"value": vid, "text": display})
 
 debug(f"get_org_groups: org={org_id}, count={len(rows)}")
 return json.dumps(rows, ensure_ascii=False)

wwwroot/api/rl_upload.dspy

@@ -1,11 +1,27 @@
 
 vendor_group_id = params_kw.get('vendor_group_id', '')
 source_url = params_kw.get('source_url', '')
-asset_type = params_kw.get('asset_type', 'Image')
+asset_type = params_kw.get('asset_type', '')
 name = params_kw.get('name', '')
 
 if not vendor_group_id or not source_url:
-    return json.dumps({"status": "error", "data": {"message": "请选择认证组合并提供素材URL"}}, ensure_ascii=False)
+    return json.dumps({"status": "error", "data": {"message": "请选择认证组合并上传素材文件"}}, ensure_ascii=False)
+
+# Validate media file type from path extension
+import os
+ext = os.path.splitext(source_url.split('?')[0])[1].lower() if source_url else ''
+media_map = {
+    '.jpg': 'Image', '.jpeg': 'Image', '.png': 'Image', '.gif': 'Image', '.bmp': 'Image', '.webp': 'Image', '.svg': 'Image',
+    '.mp4': 'Video', '.avi': 'Video', '.mov': 'Video', '.wmv': 'Video', '.flv': 'Video', '.mkv': 'Video', '.webm': 'Video',
+    '.mp3': 'Audio', '.wav': 'Audio', '.aac': 'Audio', '.flac': 'Audio', '.ogg': 'Audio', '.wma': 'Audio', '.m4a': 'Audio',
+}
+detected_type = media_map.get(ext, '')
+if ext and not detected_type:
+    return json.dumps({"status": "error", "data": {"message": f"不支持的文件类型: {ext}，请上传图片、音频或视频文件"}}, ensure_ascii=False)
+if not asset_type and detected_type:
+    asset_type = detected_type
+if not asset_type:
+    asset_type = 'Image'
 
 # If source_url is base64 data or local path, convert to public URL
 if source_url.startswith('data:') or (not source_url.startswith('http') and len(source_url) < 8000):

wwwroot/upload_asset.ui

@@ -51,11 +51,10 @@
                                         "required": true
                                     },
                                     {
-                                        "uitype": "text",
+                                        "uitype": "file",
                                         "name": "source_url",
-                                        "label": "素材URL或base64",
-                                        "rows": 4,
-                                        "placeholder": "https://... 可公开访问的图片/视频URL\n或\ndata:image/png;base64,...",
+                                        "label": "素材文件",
+                                        "accept": "image/*,audio/*,video/*",
                                         "required": true
                                     },
                                     {