feat: add repo_url to app data and update frontend to conditionally display Git Pull button

Co-authored-by: Copilot <copilot@github.com>

panel-api.py

@@ -220,6 +220,7 @@ class Handler(BaseHTTPRequestHandler):
                     "domains": fields[1],
                     "upstream": fields[2],
                     "auth": fields[3].replace("auth=", ""),
+                    "repo_url": fields[4] if len(fields) >= 5 else "",
                 })
             self._json(200, {"ok": True, "apps": apps})
             return