v1.1.3: surface daemon version + commit on maglev_info

Extend the existing maglev_info gauge with two more labels:
- version (build version, from -ldflags)
- commit (git short hash)

Mirrors nginx_ipng_stats-plugin's nginx_ipng_info pattern: a
label-only gauge value=1 carrying build metadata for Prometheus
to query and Grafana dashboards to render. Useful for spotting
version drift across the fleet with a single query, and for
populating the "Version" column of the Maglev Nodes table on
the global overview.

Existing label source_tag is preserved.

Plumbing: NewCollector / Register signatures gain version and
commit string parameters; main.go reads them from cmd.Version()
and cmd.Commit() (already imported as 'buildinfo').

Makefile

@@ -15,7 +15,7 @@ FRONTEND_WEB_SRC := $(shell find cmd/frontend/web/src -type f 2>/dev/null) \
 FRONTEND_WEB_DIST := cmd/frontend/web/dist/index.html
 
 NATIVE_ARCH  := $(shell go env GOARCH)
-VERSION      := 1.1.2
+VERSION      := 1.1.3
 COMMIT_HASH  := $(shell git rev-parse --short HEAD 2>/dev/null || echo unknown)
 DATE         := $(shell date -u +%Y-%m-%dT%H:%M:%SZ)
 LDFLAGS      := -X '$(MODULE)/cmd.version=$(VERSION)' \