Give Hammerhead its own edge with a built-in dashboard route; setup.sh installs it with Blacktip instead of Caddy

HAMMERHEAD_SELF_DOMAIN creates an edge for this machine, writes its token to <data>/self-edge.env
and adds an https route for the dashboard to that edge's config, so no reverse proxy is needed.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

store.go

@@ -111,6 +111,8 @@ type Settings struct {
 	AcmeEmail    string `json:"acmeEmail"`
 	AcmeStaging  bool   `json:"acmeStaging"`
 	SMTP         SMTP   `json:"smtp"`
+	// SelfEdgeID is this server's own edge (see HAMMERHEAD_SELF_DOMAIN).
+	SelfEdgeID string `json:"selfEdgeId,omitempty"`
 }
 
 type Secret struct {
@@ -170,6 +172,14 @@ type Options struct {
 	AlertInterval    time.Duration // how often alerts are evaluated; 0 = 15s
 	AlertDebounce    time.Duration // overrides the per-organization delay before alerting (tests)
 	OfflineAfter     time.Duration // how long an edge or site may stay silent before it counts as down; 0 = 90s
+
+	// SelfDomain (HAMMERHEAD_SELF_DOMAIN) gives this server an edge of its own, with a built-in
+	// https route for the dashboard at that name, so no reverse proxy is needed in front of it.
+	// SelfTarget is the address Hammerhead listens on (e.g. 127.0.0.1:8080); SelfTunnel is the
+	// edge's public WireGuard endpoint (default <SelfDomain>:51820).
+	SelfDomain string
+	SelfTarget string
+	SelfTunnel string
 }
 
 type Server struct {
@@ -258,6 +268,13 @@ func New(dir string, opts Options) (*Server, error) {
 			return nil, err
 		}
 	}
+	if opts.SelfDomain != "" && opts.SelfTunnel == "" {
+		s.opts.SelfTunnel = opts.SelfDomain + ":51820"
+	}
+	if err := s.ensureSelfEdge(); err != nil {
+		db.Close()
+		return nil, err
+	}
 	if err := s.save(); err != nil {
 		db.Close()
 		return nil, err