docs(windows): 跟踪 startup visible-ready 生命周期

[Cooper-X-Oak]

摘要

Closes #98

这个 draft PR 用来承接 Windows startup visible / ready 生命周期契约问题。目标不是立刻改代码，而是先把“谁拥有 first show”“什么时候可以称为 ready”这两个最容易被混淆的问题锁定下来。

修复 / 新增 / 改进

• 新增 tracking doc，冻结 issue #98 的问题边界
• 预留后续 startup visibility owner 收敛所需的 PR 入口
• 避免把 hotkey readiness、startup shell、first paint 问题一次性搅在一起

兼容

• 不包含：Tauri main window 行为变更
• 对现有用户 / 本地环境 / 构建流程的影响：仅新增 tracking 文档，no runtime impact

测试计划

• 命令：待修复方案收敛后补
• 结果：待修复方案收敛后补
• 证据路径：docs/windows-lifecycle-tracking/issue-98-startup-visible-ready.md

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[Cooper-X-Oak]

Closing this draft PR as a duplicate placeholder.\n\nIssue #98 is already being tracked by the earlier draft PR #145, which remains the canonical lifecycle PR for this topic.

[Cooper-X-Oak]

Closing as duplicate of draft PR #145 for issue #98.