fix(migrate-*): bump item-operation-timeout to 4h for large PVCs

Pipeline 754 hit `Operation Error: timeout on preparing data upload`
on immich's 250 GB library PVC. Velero's CSI plugin defaults to 30 min
for the prepare phase (CSI VolumeSnapshotContent provisioning + Kopia
DataUpload setup). Fast Ceph snapshot creation is plenty for paperless
or music-assistant but slow for big PVCs.

Add --item-operation-timeout=4h to every velero backup create call so
the prepare phase has room to finish on the largest PVCs without
falsely failing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.woodpecker/migrate-audiobookshelf.yml

@@ -180,6 +180,7 @@ steps:
           --include-namespaces "$NS" \
           --include-resources persistentvolumeclaims \
           --snapshot-move-data \
+          --item-operation-timeout=4h \
           --labels "velero.io/schedule-name=$SCHED"
 
         log "Polling Backup $BACKUP_NAME ..."

.woodpecker/migrate-immich.yml

@@ -334,6 +334,7 @@ steps:
           --include-namespaces "$NS" \
           --include-resources persistentvolumeclaims \
           --snapshot-move-data \
+          --item-operation-timeout=4h \
           --labels "velero.io/schedule-name=$SCHED"
 
         log "Polling Backup $BACKUP_NAME ..."

.woodpecker/migrate-influxdb.yml

@@ -178,6 +178,7 @@ steps:
           --include-namespaces "$NS" \
           --include-resources persistentvolumeclaims \
           --snapshot-move-data \
+          --item-operation-timeout=4h \
           --labels "velero.io/schedule-name=$SCHED"
 
         log "Polling Backup $BACKUP_NAME ..."

.woodpecker/migrate-music-assistant.yml

@@ -176,6 +176,7 @@ steps:
           --include-namespaces "$NS" \
           --include-resources persistentvolumeclaims \
           --snapshot-move-data \
+          --item-operation-timeout=4h \
           --labels "velero.io/schedule-name=$SCHED"
 
         log "Polling Backup $BACKUP_NAME ..."

.woodpecker/migrate-paperless.yml

@@ -291,6 +291,7 @@ steps:
           --include-namespaces "$NS" \
           --include-resources persistentvolumeclaims \
           --snapshot-move-data \
+          --item-operation-timeout=4h \
           --labels "velero.io/schedule-name=$SCHED"
 
         log "Polling Backup $BACKUP_NAME ..."