- rate_limit: cache OXICLOUD_TRUST_PROXY_HEADERS in OnceLock<bool> to avoid
syscall on every request (~500ns → ~1ns)
- auth middleware: insert Arc<CurrentUser> instead of bare CurrentUser;
all 5 extractors now clone Arc (~1ns) instead of 4 Strings (~60-100ns)
- search_service: pre-compute query.to_lowercase() once before loops,
eliminating N redundant heap allocations per search
Diocrafts