Phase 3 complete: per-app backup toggles, restore, storage overview

- Storage overview on backup page (SSD/HDD bars, repo stats)
- Restic password visibility + hub sync for disaster recovery
- App data discovery (HDD bind mounts, Docker volumes)
- Per-app backup toggle checkboxes with settings persistence
- Dynamic backup paths: enabled app HDD data included in restic snapshots
- Limited app restore from snapshots (self-service recovery)
- Snapshots API endpoint for restore dropdown
- Version bump to 0.8.0

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

controller/cmd/controller/main.go

@@ -109,6 +109,7 @@ func main() {
 	var backupMgr *backup.Manager
 	if cfg.Backup.Enabled {
 		backupMgr = backup.NewManager(cfg, pinger, sett, logger)
+		backupMgr.SetStackProvider(&stackAdapter{mgr: stackMgr, hddPath: cfg.Paths.HDDPath})
 		backupMgr.AfterBackup = func() {
 			nextDBDump := scheduler.NextDailyRun(cfg.Backup.DBDumpSchedule)
 			nextBackup := scheduler.NextDailyRun(cfg.Backup.ResticSchedule)
@@ -314,3 +315,41 @@ func setupLogger(cfg *config.Config) *log.Logger {
 
 	return logger
 }
+
+// stackAdapter implements backup.StackDataProvider using stacks.Manager.
+type stackAdapter struct {
+	mgr     *stacks.Manager
+	hddPath string
+}
+
+func (a *stackAdapter) GetStackComposePath(name string) (string, bool) {
+	s, ok := a.mgr.GetStack(name)
+	if !ok {
+		return "", false
+	}
+	return s.ComposePath, true
+}
+
+func (a *stackAdapter) ListDeployedStacks() []backup.StackSummary {
+	var result []backup.StackSummary
+	for _, s := range a.mgr.GetStacks() {
+		if !s.Deployed {
+			continue
+		}
+		result = append(result, backup.StackSummary{
+			Name:        s.Name,
+			DisplayName: s.Meta.DisplayName,
+			ComposePath: s.ComposePath,
+			NeedsHDD:    s.Meta.Resources.NeedsHDD,
+		})
+	}
+	return result
+}
+
+func (a *stackAdapter) GetStackHDDMounts(name string) []string {
+	s, ok := a.mgr.GetStack(name)
+	if !ok {
+		return nil
+	}
+	return stacks.ParseComposeHDDMounts(s.ComposePath, a.hddPath)
+}