fix(seo): use git commit time for sitemap lastmod instead of current time

- Use git log to get real last modified time for each page
- Skip writing sitemap if content unchanged (incremental update)
This commit is contained in:
sanbuphy
2026-03-03 18:07:49 +08:00
parent 5728ae16b3
commit 87b150a3e7
+164 -164
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