feat: solo-error penalty + fast healthcheck (instant Traefik restart)

Dashboard: add an editable 'solo-error penalty ×' (default 1.5) — a false positive only one model made (a unique wrong claim, derived from reporter count) multiplies its FP penalty, mirroring the solo-find bonus. Client-side; store stays point-free.

Deploy: speed up the healthcheck (image HEALTHCHECK + compose example: interval 30s->5s, start_period 10s, start_interval 1s). Traefik gates routing on the Docker health status, so the old 30s-to-first-probe meant ~30s of 502s after a restart; the daemon binds the port in ms, so it now goes healthy in ~1s. Data is on the volume; only fire-and-forget emits in the ~1s window are at risk.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -15,5 +15,10 @@ ENV GADFLY_REPORTS_ADDR=:8090 \
     GADFLY_REPORTS_DB=/data/gadfly-reports.db
 EXPOSE 8090
 VOLUME ["/data"]
+# Fast probe so an orchestrator (e.g. Traefik) resumes routing within a few seconds
+# of a (re)start — the daemon binds the port in milliseconds. First probe at
+# --interval (5s); --start-period keeps early failures from flapping the status.
+HEALTHCHECK --interval=5s --timeout=3s --start-period=10s --retries=3 \
+  CMD wget -q -O - http://localhost:8090/healthz || exit 1
 ENTRYPOINT ["/usr/local/bin/gadfly-reports"]
 CMD ["serve"]