webterm: fix screenshot tile bootstrap and add request logging
Fix screenshot generation for requested dashboard route keys by preserving non-empty route_key lookups when no session exists yet, allowing lazy session creation instead of returning 404.
Add server-side observability with HTTP request logs (method, URI, status, bytes, duration, remote address) and websocket connection lifecycle logs for connect/disconnect and unexpected read errors.
Update README title/positioning and expand feature bullets to document Ghostty WASM rendering and mobile/touch keyboard support.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
GitHub Copilot
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