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/internal/report/builder.go

@@ -172,6 +172,11 @@ func buildBackupReport(cfg *config.Config, backupMgr *backup.Manager) BackupRepo
 	}
 	br.IntegrityOK = status.LastCheckOK
 
+	// Include restic password for hub-side disaster recovery
+	if pw, err := backupMgr.GetResticPassword(); err == nil {
+		br.ResticPassword = pw
+	}
+
 	return br
 }