### What this PR does / why we need it?
1. issue with "resolved", 7 days stale, 14 days closed after stale with
`stale` and `resolved` label.
2. issue with "awaiting-feedback", 7 days stale, 14 days closed after
stale with `stale` and `awaiting-feedback` label.
Change items:
- Add a scheduled stale-management workflow to process resolved and
awaiting-feedback issues independently.
- Automatically mark inactive issues as stale , post tailored reminder
messages, and close issues after a grace period.
- Remove source labels when issues become active again, and disable PR
stale handling so the automation remains issue-scoped.
### Does this PR introduce _any_ user-facing change?
- No API or runtime behavior changes.
- This PR only updates GitHub issue automation (labeling and stale
management workflow).
### How was this patch tested?
- Test locally
- vLLM version: v0.17.0
- vLLM main:
4034c3d32e
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Signed-off-by: drizzlezyk <drizzlezyk@163.com>
79ef41a53d