fix: preserve replacement session waiter on cleanup

[iuiu-py]

Modifications

• Fixes [Bug] 同一 session 注册新等待器后，旧 SessionWaiter 结束会删除新等待器 #9996.
• SessionWaiter._cleanup() now removes the session registration only when the registry still points to that exact waiter instance.
• Added regression coverage for both the stale-waiter cleanup case and normal ownership cleanup.

Test Results

• Red: uv run pytest tests/test_session_waiter.py -q failed before the fix because cleanup removed the replacement waiter (KeyError: same-session).
• Green: after the fix, the same command passes with 2 passed.
• uv run ruff format astrbot/core/utils/session_waiter.py tests/test_session_waiter.py completed; focused uv run ruff check ... passed.

Checklist

• This is NOT a breaking change.
• My changes have been well-tested, and verification commands/results are provided above.
• No WebUI navigation or terminology changed, so no WebUI documentation update is needed.
• No new dependencies are introduced.
• My changes do not introduce malicious code.

Summary by Sourcery

Preserve replacement session waiters when cleaning up superseded registrations.

Bug Fixes:

• Prevent stale session waiters from removing a newer waiter registered for the same session during cleanup.

Tests:

• Add regression tests covering stale-waiter cleanup and cleanup by the current session owner.

[sourcery-ai]

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

Sourcery assessment

Approved.

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