perf(sitemapd): speed up large sitemap parsing - #650
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📚 Description
Parsing a 10.1 MiB sitemap with 50,000 plain URL records spent most of its time allocating XML parser state for each record. This adds a scanner based fast path with a validated fallback for complex XML, preserves fetch chunks instead of joining them, and skips redundant encoding for string input. Median local retained parse time fell from 452.4 ms to 75.0 ms; fetched bodies also avoid one full size buffer copy.