fix: add stdout startup completion signal for AstrBot Launcher

[Blueteemo]

问题描述

AstrBot Launcher 通过监控 Python 进程 stdout 中的 AstrBot 启动完成 来判断实例是否启动完成。但当前代码使用 logger.info("AstrBot started.") 输出启动消息，该消息走 loguru 日志通道（stderr），Launcher 无法检测到，导致 300 秒后超时 kill 进程。

修复方案

在 core_lifecycle.py 的 start() 方法中添加 print("AstrBot 启动完成", flush=True)，将启动完成信号输出到 stdout。

关联 Issue

Fixes #7982

Summary by Sourcery

Bug Fixes:

• Emit a dedicated startup completion signal via stdout in addition to the existing log message to prevent launcher timeout when monitoring process readiness via standard output.

[sourcery-ai]

Hey - I've left some high level feedback:

• Since this print is intentionally bypassing the logger for the launcher’s stdout contract, consider adding a short comment explaining that it’s a startup completion signal consumed by AstrBot Launcher so future refactors don’t remove or redirect it accidentally.
• To avoid potential confusion around mixed languages in startup messages, consider aligning the print text with any existing constant or clearly defined protocol string used by the launcher, or centralizing it as a constant so both sides rely on the same value.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this `print` is intentionally bypassing the logger for the launcher’s stdout contract, consider adding a short comment explaining that it’s a startup completion signal consumed by AstrBot Launcher so future refactors don’t remove or redirect it accidentally.
- To avoid potential confusion around mixed languages in startup messages, consider aligning the `print` text with any existing constant or clearly defined protocol string used by the launcher, or centralizing it as a constant so both sides rely on the same value.

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[gemini-code-assist]

Code Review

This pull request adds a print statement to signal the completion of the AstrBot startup process. A review comment points out that since background tasks are initialized asynchronously in the _load method, the startup signal might be printed before these tasks have actually begun. It is suggested to include await asyncio.sleep(0) before the print statement to ensure the event loop has an opportunity to start the background tasks.

[Raven95676]

您好，AstrBot Launcher已在v0.3.3版本适配了新的日志行为。

另外我这边复核了一下AstrBot当前代码，log.py中的loguru sink已显式配置为sys.stdout，因此并不存在因stderr导致Launcher无法检测启动完成的问题。