Two related operational improvements:
1. HTTP timeouts on http.Server (ReadHeaderTimeout 10s, ReadTimeout +
WriteTimeout 60s, IdleTimeout 120s). Caps slow-client connection
hold time; closes the slowloris vector. Listing + tool-HTML
responses complete in milliseconds even with gzip, so 60s is
generous for legit traffic.
2. --access-log defaults to <ZDDC_ROOT>/.zddc.d/logs/access-<host>.log
instead of stderr-only. The server auto-creates the parent tree
(mode 0750), so a fresh deployment gets an audit trail without
operator setup. Every JSON record carries a `host` field (from
os.Hostname) — multi-replica deployments share the .zddc.d/logs/
directory but write to per-host filenames, and downstream
aggregators can disambiguate via the host field.
Opt-out: --access-log= (explicit empty). Distinguishing "unset"
from "set to empty" follows the same pattern config.go already
uses for --cors-origin.
Live verification:
$ zddc-server -root /tmp/r -addr 127.0.0.1:8765 -tls-cert none -insecure-direct
$ curl http://127.0.0.1:8765/
$ ls /tmp/r/.zddc.d/logs/
access-bizon.log
$ tail -1 /tmp/r/.zddc.d/logs/access-bizon.log
{"time":...,"level":"INFO","msg":"access","host":"bizon",...,"email":"anonymous","method":"GET","path":"/","status":200,...}
$ zddc-server -root /tmp/r ... -access-log= # opt-out
$ ls /tmp/r/.zddc.d/ # empty: no logs/ created
ZDDC
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