docs: fix Notification hook matcher example

[he-yufeng]

Summary

• replace the non-functional permission_prompt Notification hook example with real background-task notification types
• correct the Notification matcher wording in the English and Chinese hook docs
• update the hook config roundtrip fixture so it no longer preserves the broken matcher

Fixes #2330

To verify

• uv run --package kimi-cli --group dev pytest tests/hooks/test_integration.py::test_config_roundtrip_toml tests/hooks/test_integration.py::test_notification_hook -q -p no:cacheprovider
• uv run --package kimi-cli --group dev ruff check tests/hooks/test_integration.py
• git diff --check

Note: running the whole tests/hooks/test_integration.py file on Windows still hits existing shell assumptions around bash/python3; the two tests touched by this patch pass.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.

[randyxian08]

One remaining doc mismatch: this patch fixes the example and matcher table, but the use-case list above still says desktop notifications can "Send alerts when human approval is needed" / "在需要人工审批时发送通知".

Since approval requests are not Notification events, that sentence would still leave the page claiming approval notifications are supported after this change. I would change it to background task notifications, or add an explicit note that approval requests currently are not emitted through the Notification hook.

[he-yufeng]

Follow-up pushed in 5aec6ff.

Updated the top use-case list in both English and Chinese docs to use background task notifications instead of human approval notifications.

Validation on Windows:

• git diff --check
• uv run pytest tests/hooks/test_integration.py::test_config_roundtrip_toml -q: 1 passed
• uv run ruff check tests/hooks/test_integration.py
• uv run ruff format --check tests/hooks/test_integration.py

Note: the full tests/hooks/test_integration.py file still has existing Windows shell/python3 failures unrelated to this doc-only change.

[he-yufeng]

Closing this during backlog cleanup. There has been no human maintainer signal, the repository is no longer an active target for new work, and keeping many stale small PRs open makes the queue noisy. Happy to reopen or refresh it if maintainers want this specific change.