v0.25.0 — Debug page: operator testing & diagnostics dashboard

Debug-mode-only dashboard (/debug) with 8 collapsible sections:
system diagnostics, notification testing, backup triggers, storage
simulation, hub & connectivity, self-update dry-run, DR/setup wizard,
and in-memory log viewer. Migrates debug dump from API router to web
server. Adds ring buffer log capture, storage disconnect simulation,
event history tracking, and cross-drive/self-update test methods.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/internal/web/server.go

@@ -65,6 +65,11 @@ type Server struct {
 
 	// Asset syncer for Hub-managed assets (optional)
 	assetsSyncer *assets.Syncer
+
+	// Debug mode support
+	logBuffer      *LogBuffer
+	debugCallbacks *DebugCallbacks
+	startTime      time.Time
 }
 
 func NewServer(cfg *config.Config, stackMgr *stacks.Manager, cpuCollector *system.CPUCollector, backupMgr *backup.Manager, crossDrive *backup.CrossDriveRunner, sched *scheduler.Scheduler, sett *settings.Settings, alertMgr *AlertManager, notif *notify.Notifier, updater *selfupdate.Updater, logger *log.Logger, version string) *Server {
@@ -143,6 +148,36 @@ func (s *Server) SetAssetsSyncer(as *assets.Syncer) {
 	s.assetsSyncer = as
 }
 
+// SetLogBuffer sets the in-memory log ring buffer for the debug log viewer.
+func (s *Server) SetLogBuffer(lb *LogBuffer) {
+	s.logBuffer = lb
+}
+
+// SetDebugCallbacks sets the callbacks for debug endpoints that need main.go wiring.
+func (s *Server) SetDebugCallbacks(dc *DebugCallbacks) {
+	s.debugCallbacks = dc
+}
+
+// SetStartTime records the controller start time for uptime calculation.
+func (s *Server) SetStartTime(t time.Time) {
+	s.startTime = t
+}
+
+// isDebug returns true if the controller is running in debug mode.
+func (s *Server) isDebug() bool {
+	return s.cfg.Logging.Level == "debug"
+}
+
+// ServeDebugAPI handles /api/debug/* routes (JSON API for debug operations).
+// Called from the mux carve-out; debug mode check is done here.
+func (s *Server) ServeDebugAPI(w http.ResponseWriter, r *http.Request) {
+	if !s.isDebug() {
+		http.NotFound(w, r)
+		return
+	}
+	s.handleDebugAPI(w, r)
+}
+
 // InRestoreMode returns true if the server is in DR restore mode.
 func (s *Server) InRestoreMode() bool {
 	s.restoreMu.RLock()
@@ -239,6 +274,12 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case strings.HasPrefix(path, "/apps/"):
 		slug := strings.TrimPrefix(path, "/apps/")
 		s.appDetailHandler(w, r, slug)
+	case path == "/debug":
+		if !s.isDebug() {
+			http.NotFound(w, r)
+			return
+		}
+		s.debugPageHandler(w, r)
 	default:
 		http.NotFound(w, r)
 	}