feat(ui): rename 图生图→参考图 with count; distinguish video 首尾帧 vs 参考图

- model list: any model with max_reference_images>0 shows 首尾帧 N (frame mode)
  or 参考图 N (asset/other); drop the count-less "图生图" label
- ModelFormModal / TestModal: capability labels use 参考图 (not 图生图)
- grok-video uses reference_mode=asset (参考图), runway/adobe video stay frame (首尾帧)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -60,3 +60,6 @@ __pycache__/
 Thumbs.db
 .idea/
 .vscode/
+
+# fast-deploy build artifact
+/frontend/dist.tar.gz