fix(skills-admin): market 项加 publish_records 字段，列表"已发布"标识正确显示

修复顶部卡片(已发布=50)与列表行(市场=未发布)不一致问题：
列表行 isPublished 仅看 skill.publish_records[]，
market_apps 项无该字段故一直显示"未发布"。
改为 market_app_to_skill_dict 中按 status 注入 publish_records。

backend/python/app/api/admin/skills_admin.py

@@ -84,6 +84,8 @@ def market_app_to_skill_dict(app: "MarketApp") -> dict:
         "created_at": app.created_at.isoformat() if getattr(app, "created_at", None) else None,
         "updated_at": getattr(app, "updated_at", None).isoformat() if getattr(app, "updated_at", None) else None,
         "source": "market",
+        # 让前端 isPublished(skill) 能正确识别 market 已发布项
+        "publish_records": [{"status": "published"}] if status == "published" else [],
     }