Turn the status page into a full status page generator

Components can be put in groups and given public names. Public incidents carry
posts written for customers (the internal timeline stays internal), the
components they affect, and a page for each incident plus paged history.
Scheduled maintenance has its own window, shows affected components as under
maintenance, and is announced when scheduled, started, ended or canceled.

Branding (title, logo, accent checked for contrast, contact link, footer) and a
custom domain that serves only the status page. Visitors follow by RSS, by
confirmed email, or by webhook that must answer a test request. Admin UI for
all of it, tests, README and design notes.

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

internal/sandbar/server.go

@@ -61,6 +61,13 @@ type Server struct {
 	anaSecret string
 	anaTry    map[string][]time.Time
 
+	statusMu  sync.Mutex // the status page settings cache and the signing secret
+	statusCfg *StatusSettings
+	statusKey []byte
+	subMu     sync.Mutex // per-address limit on public subscribe requests
+	subTry    map[string][]time.Time
+	notifyWG  sync.WaitGroup // status page notifications in flight
+
 	stop chan struct{}
 	wg   sync.WaitGroup
 }
@@ -75,7 +82,7 @@ func New(opts Options, st *Store) *Server {
 	if opts.HitDays <= 0 {
 		opts.HitDays = 365
 	}
-	return &Server{opts: opts, st: st, hub: newHub(), running: map[string]bool{}, loginTry: map[string][]time.Time{}, anaTry: map[string][]time.Time{}, stop: make(chan struct{})}
+	return &Server{opts: opts, st: st, hub: newHub(), running: map[string]bool{}, loginTry: map[string][]time.Time{}, anaTry: map[string][]time.Time{}, subTry: map[string][]time.Time{}, stop: make(chan struct{})}
 }
 
 func (s *Server) now() time.Time {
@@ -89,12 +96,14 @@ func (s *Server) now() time.Time {
 func (s *Server) Start() {
 	s.every(time.Second, func() { s.runDueMonitors(s.now()) })
 	s.every(5*time.Second, func() { s.escalate(s.now()) })
+	s.every(30*time.Second, func() { s.runMaintenance(s.now()) })
 	s.every(time.Hour, func() { s.st.prune(s.now(), s.opts.MessageDays, s.opts.CheckDays, s.opts.HitDays) })
 }
 
 func (s *Server) Close() {
 	close(s.stop)
 	s.wg.Wait()
+	s.notifyWG.Wait()
 }
 
 func (s *Server) every(d time.Duration, f func()) {