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fix(chart): use 127.0.0.1 for admin probes and dedupe ServiceMonitor labels

Caddy's admin API binds 127.0.0.1:2019 (IPv4-only), but BusyBox wget in the
caddy:2-alpine base image resolves `localhost` to ::1 first and gets
"Connection refused", making the readiness/liveness probes fail in a loop.
Use 127.0.0.1 explicitly in the probes and the /stop preStop hook.

Build ServiceMonitor metadata.labels as a single merged dict so user-supplied
selector labels can't emit duplicate YAML keys and can't override chart
identity labels (name/instance/managed-by/chart/version/component).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>