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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[Soulter]

Hi, thanks for fixing this. Did you reproduce and test the fix?

[wcqqq1214]

Hi, thanks for fixing this. Did you reproduce and test the fix?

Yes, I used Codex to help reproduce and test it locally, both by closing the old connection after reconnecting with the same ID and by simulating dropped traffic with delayed cleanup. The original code failed in both cases; the fix passed, including 10/10 reconnect rounds.