feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/webapp/handlers_status.go

@@ -0,0 +1,38 @@
+package webapp
+
+import (
+	"net/http"
+	"time"
+)
+
+// handleStatus renders the host metrics snapshot. Phase 1 reads
+// only /proc and statfs; the lsblk / smartctl / sensors
+// integrations are deferred to the worker webapp expansion tracked
+// in docs/distributed/worker-web-app.md §6.7 (out of band; not
+// shipped in this repo). The current Snapshot struct accommodates
+// the extra sections if/when those are wired in.
+//
+// TODO(worker-web-app §6.7): surface lsblk / smartctl / sensors /
+// docker info on this page once the worker process is allowed to
+// invoke those CLI tools. The cli tools are not bundled with the
+// worker binary; install them separately on the host if needed.
+func (s *Server) handleStatus(w http.ResponseWriter, r *http.Request) {
+	writeNoStore(w)
+	sess, _ := sessionFromContext(r.Context())
+	snap, snapAt := s.metrics.Last()
+	data := statusPageData{
+		basePageData: s.newBasePage(r, "Server status", sess),
+		Snapshot:     snap,
+		SnapshotAt:   snapAt,
+	}
+	if err := s.templates.Execute(w, "status.html", data); err != nil {
+		s.deps.Logger.Printf("render status: %v", err)
+		http.Error(w, "template error", http.StatusInternalServerError)
+	}
+}
+
+type statusPageData struct {
+	basePageData
+	Snapshot   Snapshot
+	SnapshotAt time.Time
+}