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feat: Add version + commit hash endpoint to all services (#144)

* feat: Add version + commit hash endpoint to all services (#143)

Every service now exposes a /version endpoint returning { version, commit }
with the git commit hash baked in at build time. GIT_COMMIT build arg added
to all Dockerfiles, compose files, and CI workflows.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: Add service_version_info Prometheus metric and Grafana version panels

Add Prometheus info gauge (value=1, version/commit labels) to all services
and version stat panels to all Grafana dashboards for at-a-glance version
visibility.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: Show version+commit as subtitle on status panels

Replace separate version panels with a PromQL join on the status panels.
Uses group_left to carry version/commit labels from service_version_info
into the up metric query, displayed as a subtitle via textMode value_and_name.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: Fix duplicate series in status panels and add UP/DOWN mappings

Use or on(job) instead of plain or to prevent the fallback query from
producing a second series when version labels differ. Also add value
mappings (0→DOWN, 1→UP) to archon-services status panels which were
missing them.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: Use dashboard variables for version subtitle instead of PromQL join

Replace the PromQL group_left join with hidden Grafana dashboard variables
populated via label_values(). This avoids the duplicate series issue from
the or fallback and is more reliable across Prometheus versions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: Log version and commit hash on service startup

All services now display version and commit hash in their startup log
messages for easier identification of running versions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refacto... (continued)

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