feat: 非阻塞检查网络注册状态，优化网络注册逻辑

[chenxuuu]

修复 #57

[gemini-code-assist]

Summary of Changes

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此拉取请求旨在解决 #57 提到的问题，通过将网络注册过程从阻塞式改为非阻塞式，显著优化了设备的启动逻辑。这一改进避免了设备在网络注册耗时时出现卡顿，提升了用户体验和设备的响应能力。同时，它确保了关键的启动通知仅在网络完全就绪后才发送。

Highlights

• 非阻塞网络注册: 将网络注册检查从阻塞式改为非阻塞式，避免设备启动时卡顿。
• 周期性检查: 在主循环中引入了周期性网络注册状态检查机制，确保设备持续监控网络状态。
• 启动通知逻辑优化: 调整了启动通知的发送逻辑，确保仅在配置有效且网络已注册后才发送通知，即使网络注册稍后完成。

Changelog

• code/code.ino
  • 移除了 setup() 函数中阻塞式的网络注册等待循环。
  • 在 loop() 函数中实现了周期性的非阻塞网络注册状态检查。
  • 更新了启动通知的发送条件，使其依赖于成功的网络注册。

Activity

• 目前没有与此拉取请求相关的评论或审查活动。

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[gemini-code-assist]

Code Review

本次变更将阻塞式的网络注册检查改为了非阻塞的周期性检查，避免了设备启动时可能出现的长时间等待，这是一个很好的优化。代码逻辑清晰，实现了预期的功能。我只发现一处代码重复的问题，建议提取成一个独立的函数以提高代码的可维护性。

[Copilot]

Pull request overview

该 PR 针对 Issue #57，将“等待网络注册”的阻塞式流程改为后台周期性检查，避免设备在网络注册阶段卡死，提升串口/HTTP 的可用性与可调试性。

Changes:

• 移除 setup() 中阻塞等待 CEREG 注册的 while 循环，启动流程不再被网络注册卡住
• 增加 networkRegistered 状态与定时检查逻辑，在 loop() 中周期性检测并在注册成功后触发启动通知
• 启动通知发送条件调整为“配置有效且已注册网络”，并在注册成功瞬间补发一次

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