Docs: add LogEvent and DB logging docs Introduce structured logging docs and JSON response conventions. Added DatabaseLogWriter, LogEvent, LogEventFingerprint, and LogEventSanitizer documentation and described the DB snapshot/writer, sanitization, fingerprinting, and migration. Update Logger, Log, Observability, ErrorLog, JsonResponse, Controller, and Home index docs to use LogEvent (ErrorLog is now a backward-compatible alias), to describe the new DB writer pipeline, sanitization, tracing/fingerprint behavior, and to prefer data/meta envelopes and RFC Problem Details for JSON endpoints. Removed legacy ElkLogger and InsightHub docs and updated references and examples accordingly.

viames committed May 5, 2026