feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

internal/webapp/handlers_overview.go

@@ -0,0 +1,84 @@
+package webapp
+
+import (
+	"net/http"
+	"strings"
+	"time"
+)
+
+// handleOverview is the landing page after login. Phase 1 shows the
+// worker status, recent results counts, and a tail of the worker
+// log buffer. The data shape will grow in later phases as the
+// heartbeat inventory and 24h result counts come online.
+func (s *Server) handleOverview(w http.ResponseWriter, r *http.Request) {
+	writeNoStore(w)
+	sess, _ := sessionFromContext(r.Context())
+	snap, snapAt := s.metrics.Last()
+	data := overviewPageData{
+		basePageData:    s.newBasePage(r, "Overview", sess),
+		WorkerID:        workerIDOrDash(s.deps.Runner),
+		RegionCode:      regionOrDash(s.deps.Runner),
+		WorkerState:     workerState(s.deps.Runner, s.deps.StartedAt),
+		LastAckAt:       lastAckOrZero(s.deps.Runner),
+		StartedAt:       s.deps.StartedAt,
+		Snapshot:        snap,
+		SnapshotAt:      snapAt,
+		DiscoveredCount: len(s.inventory.Snapshot()),
+		ResultCount:     len(s.deps.Runner.RecentResults(1000)),
+		NotifCount:      len(s.deps.Runner.RecentNotifications(1000)),
+		LogTail:         s.logBuffer.Tail(20),
+	}
+	if err := s.templates.Execute(w, "overview.html", data); err != nil {
+		s.deps.Logger.Printf("render overview: %v", err)
+		http.Error(w, "template error", http.StatusInternalServerError)
+	}
+}
+
+func workerIDOrDash(v WorkerView) string {
+	if v == nil {
+		return "—"
+	}
+	return v.WorkerID()
+}
+
+func regionOrDash(v WorkerView) string {
+	if v == nil {
+		return "—"
+	}
+	return v.RegionCode()
+}
+
+func workerState(v WorkerView, startedAt time.Time) string {
+	if v == nil {
+		return "—"
+	}
+	if last := v.LastHeartbeatAck(); !last.IsZero() && last.After(startedAt) {
+		return "connected"
+	}
+	return "starting"
+}
+
+func lastAckOrZero(v WorkerView) time.Time {
+	if v == nil {
+		return time.Time{}
+	}
+	return v.LastHeartbeatAck()
+}
+
+// overviewPageData is the data backing overview.html.
+type overviewPageData struct {
+	basePageData
+	WorkerID        string
+	RegionCode      string
+	WorkerState     string
+	LastAckAt       time.Time
+	StartedAt       time.Time
+	Snapshot        Snapshot
+	SnapshotAt      time.Time
+	DiscoveredCount int
+	ResultCount     int
+	NotifCount      int
+	LogTail         []string
+}
+
+var _ = strings.TrimSpace