增加监控导出看板清单结构化输出

[ghangz]

这次改动补上了监控导出看板清单结构化输出，主要是为了解决监控导出与部署排查流程里相关信息不够集中、人工整理成本较高的问题，让日常排查、验证和结果归档更直接。

实现上补充了对应工具或脚本逻辑，同时尽量保持现有用法不变，避免影响已有流程。

这一分支已经在沐曦算力环境完成实际验证，相关检查均已通过，现提交合入。

[gemini-code-assist]

Code Review

This pull request introduces a new Python script, tools/dashboard_inventory.py, to inventory Grafana dashboards by parsing JSON files in the deployment directory. The reviewer suggested improving the script's robustness by wrapping the JSON parsing in a try-except block to handle potential decoding errors gracefully. Additionally, they recommended breaking up a long line of code to comply with PEP 8 line length guidelines.

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[gemini-code-assist]

这里有两个可以改进的地方：

1. 健壮性（Robustness）：直接调用 json.loads() 解析文件，如果某个 JSON 文件格式损坏，整个脚本会直接崩溃。建议添加 try-except 块捕获 json.JSONDecodeError，并抛出包含文件路径的友好错误信息，方便排查。
2. 代码风格（PEP 8）：原第 16 行的代码长度（161 字符）严重超出了 PEP 8 规范推荐的单行长度限制（79 或 120 字符）。建议将其折行以提高可读性。

以下是改进后的代码建议：

Suggested change

	data = json.loads(path.read_text(encoding="utf-8-sig"))
	panels = data.get("panels", [])
	dashboards.append({"path": path.relative_to(root).as_posix(), "title": data.get("title", ""), "uid": data.get("uid", ""), "panel_count": len(panels)})
	try:
	data = json.loads(path.read_text(encoding="utf-8-sig"))
	except json.JSONDecodeError as e:
	raise RuntimeError(f"Failed to parse JSON file {path}: {e}") from e
	panels = data.get("panels", [])
	dashboards.append(
	{
	"path": path.relative_to(root).as_posix(),
	"title": data.get("title", ""),
	"uid": data.get("uid", ""),
	"panel_count": len(panels),
	}
	)

References

1. PEP 8: Limit all lines to a maximum of 79 characters (or 120 for relaxed projects) to maintain readability. ^(link)