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Closes #1498. Report per-site total requests, total traffic and QPS, and add a quick switch for enabling a site's access log. Traffic totals were previously extrapolated from the average bytes of the 50 rows on the current page, so the figure moved as you paged. The cause was that SearchRequest.IncludeStats was declared but never implemented, leaving SearchResult.Stats nil. Bleve has no sum aggregation, so the new searcher stats pass walks the match set with a SearchAfter cursor loading only bytes_sent and request_time. The scan is capped at 200k documents; past that it extrapolates from the scanned prefix and reports Approximate so the UI can mark the value. Results are cached under a key that strips pagination and sorting, since the aggregation describes the whole match set rather than one page. The dashboard summary gains total_traffic, avg_qps and peak_qps. These ride along with the scan that already fills the hourly and daily buckets, so no extra query is needed. Peak QPS comes from per-minute buckets rather than the existing hourly ones, which would flatten a real peak. The Access Log switch writes or removes the access_log directive for the current server, with a path proposed from the new default_log_dir endpoint, so enabling per-site logging no longer means typing the directive by hand. A site declaring no directive inherits the shared default log, whose traffic belongs to every other site too. The switch is offered for http servers only, as the log viewer and indexer parse http access log formats. "access_log off;" now reads as off rather than as a log named "off". Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>