fix: preserve reverse WebSocket connections after reconnect

[wcqqq1214]

Fixes #10154. After a reconnect with the same X-Self-ID, delayed cleanup of the old connection can remove the new connection's registration, causing ApiNotAvailable on sends.

Modifications

Override CQHttp cleanup locally in the adapter: delete the registration only if it still belongs to the closing WebSocket.

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results

• Connect A and B with the same ID, then close A: B keeps receiving and sending messages (10/10 rounds passed).
• Simulate dropped traffic and delayed cleanup with a temporary 3-second server read timeout: original code fails; fixed code preserves B. This checks application-level timeout, not OS TCP timeout.
• Existing OneBot tests: 19 passed. Ruff, docs build, and diff checks passed.

Checklist

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 📚 I checked the affected WebUI instructions and screenshots in docs/zh and docs/en against the changed navigation, page structure, and labels, and updated them in this PR (or explained why no documentation update is needed). For renamed, moved, or merged entry points, I included an old entry → new entry mapping in the documentation and changelog.
  / 我已对照变化后的 WebUI 入口、页面结构和术语，核对并在本 PR 中更新 docs/zh 和 docs/en 的相关操作说明与截图（或说明无需更新文档的原因）。入口改名、移动或合并时，已在文档和 changelog 中补充 旧入口 → 新入口 对照。

  No WebUI changes; documentation updates are not needed.

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Bug Fixes:

• Preserve the active reverse WebSocket registration when an older connection with the same self-ID is cleaned up after reconnecting.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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