v2 post-migration bug fixes, lidarr_missing_art port, and Partnership SSH/FolderView3 enhancements

Bug fixes across the ecosystem after v1→v2 architecture migration and Unraid 7.2.5 upgrade:

- common.sh: fix _alias_array() phantom empty element (removed [@]:-} pattern), fix
  resolve_remote_ip() with Tailscale FQDN lowercase + awk fallback, add FANART/LASTFM
  key aliases in detect_hosts(), global [@]:-} sweep across 10+ scripts
- webgui_restart.sh: fix emhttp detection (pgrep emhttpd) and restart command for 7.2.5
  (/usr/local/sbin/emhttp stop && start — rc.emhttp removed in 7.2.5)
- bandwidth_monitor.sh, continuous_scripts_status.sh: fix 'local' keyword outside function
- backup_verify.sh: fix resolve_remote_ip() called before detect_hosts()
- Orchestrators: fix script display duplication bug in status output (${entry##*/})
- rsync_stop.sh, git_pull_execute.sh, partnership_manager.sh, coffee_report: lowercase all
  tailscale ip -4 call sites to match Tailscale's lowercase device names
- master_host1.conf: fix SSH key path (gmer4lfe_rsync_automation), add FANART/LASTFM keys
- master_host2.conf: add FANART/LASTFM API keys

New: Media/lidarr_missing_art.sh
- Full ecosystem port of standalone Lidarr artwork fetcher
- Fetches missing album art via fanart.tv + Last.fm APIs
- @tsv batch extraction: 1 jq call per API response vs N*albums (8050 albums in 24s)
- HOST guard (HOST1 only), --status, --dry-run, acquire_lock

New: Initial_run/ssh_setup.sh
- Generates {hostname}_rsync_automation ed25519 keypair (skip if exists, --force to regen)
- ssh-copy-id to remote via Tailscale IP, auto-updates master_host*.conf
- --validate mode: strike tracking (SSH_MAX_STRIKES, SSH_STRIKE_RESET_HRS),
  notify at limit — Tailscale-unreachable remote does NOT count as SSH strike

New: Initial_run/partnership_onboard.sh
- Orchestrator: ssh_setup.sh then partnership_manager.sh --onboard in one command

Partnership/partnership_manager.sh: FolderView3 integration
- Derive partner folder name at runtime (strip unraid- prefix case-insensitively)
- --onboard: create {Mirror}-Failover folder with failover tier containers
- --offboard (both paths): stop + rm containers in folder, remove JSON entry
- --check: calls ssh_setup.sh --validate when IP resolves but SSH state empty
- --status: shows FolderView3 folder state and containers inline

master.conf: SSH_MAX_STRIKES, SSH_STRIKE_RESET_HRS, PARTNERSHIP_FOLDERVIEW3,
PARTNERSHIP_FOLDERVIEW3_URL added to Partnership section

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

Orchestrators/weekly_sync_maintenance.sh

@@ -143,7 +143,7 @@ if [[ "$SHOW_STATUS" == true ]]; then
     if [[ ${#WEEKLY_SYNC_SHARES[@]} -eq 0 ]]; then
         warn "  No WEEKLY_SYNC_SHARES configured"
     else
-        for share in "${WEEKLY_SYNC_SHARES[@]:-}"; do
+        for share in "${WEEKLY_SYNC_SHARES[@]}"; do
             [[ -n "$share" ]] && echo "  $ICON_SYNC $(basename "$share") ($share)"
         done
     fi
@@ -152,13 +152,13 @@ if [[ "$SHOW_STATUS" == true ]]; then
     if [[ ${#WEEKLY_MAINTENANCE_SCRIPTS[@]} -eq 0 ]]; then
         echo "  None configured"
     else
-        for entry in "${WEEKLY_MAINTENANCE_SCRIPTS[@]:-}"; do
-            [[ -n "$entry" ]] && echo "  $ICON_GEAR $(basename "${entry%% *}") ${entry#* }"
+        for entry in "${WEEKLY_MAINTENANCE_SCRIPTS[@]}"; do
+            [[ -n "$entry" ]] && echo "  $ICON_GEAR ${entry##*/}"
         done
     fi
     echo ""
     echo "━━━ Containers (from profile config) ━━━"
-    for c in "${MAINTENANCE_CONTAINERS[@]:-}"; do
+    for c in "${MAINTENANCE_CONTAINERS[@]}"; do
         [[ -n "$c" ]] && echo "  $ICON_CONTAINERS $c"
     done
     echo "━━━━━━━━━━━━━━━━━━━━━━━"
@@ -203,12 +203,12 @@ echo "━━━ $ICON_GEAR Container Updates ━━━"
 
 if [[ "$WEEKLY_SYNC_UPDATES" == true ]]; then
     if [[ "$DRY_RUN" == true ]]; then
-        for c in "${MAINTENANCE_CONTAINERS[@]:-}"; do
+        for c in "${MAINTENANCE_CONTAINERS[@]}"; do
             [[ -n "$c" ]] && warn "DRY RUN — would pull: $c"
         done
     else
         log "Pulling local container updates..."
-        for c in "${MAINTENANCE_CONTAINERS[@]:-}"; do
+        for c in "${MAINTENANCE_CONTAINERS[@]}"; do
             [[ -z "$c" ]] && continue
             IMAGE=$(timeout "$DOCKER_TIMEOUT" docker inspect \
                 "$c" --format '{{.Config.Image}}' 2>/dev/null)
@@ -233,7 +233,7 @@ if [[ "$WEEKLY_SYNC_UPDATES_REMOTE" == true ]]; then
         warn "DRY RUN — would pull updates on $REMOTE_SERVER_NAME"
     else
         log "Pulling remote container updates on $REMOTE_SERVER_NAME..."
-        for c in "${MAINTENANCE_CONTAINERS[@]:-}"; do
+        for c in "${MAINTENANCE_CONTAINERS[@]}"; do
             [[ -z "$c" ]] && continue
             IMAGE=$(timeout "$SSH_TIMEOUT" ssh -i "$SSH_KEY" \
                 -o ConnectTimeout="$SSH_TIMEOUT" \
@@ -323,7 +323,7 @@ fi
 if [[ ${#WEEKLY_MAINTENANCE_SCRIPTS[@]} -gt 0 ]]; then
     echo ""
     echo "━━━ $ICON_GEAR Post-sync Jobs ━━━"
-    for script_entry in "${WEEKLY_MAINTENANCE_SCRIPTS[@]:-}"; do
+    for script_entry in "${WEEKLY_MAINTENANCE_SCRIPTS[@]}"; do
         [[ -z "$script_entry" ]] && continue
         echo ""
         run_job "$script_entry"
@@ -344,15 +344,15 @@ echo "$ICON_GEAR   Updates:   local=${WEEKLY_SYNC_UPDATES:-false} remote=${WEEKL
 echo ""
 
 echo "$ICON_SYNC  Sync jobs ($SHARE_COUNT):"
-for job in "${PASS[@]:-}"; do echo "  $ICON_DONE  $job"; done
-for job in "${FAIL[@]:-}"; do echo "  $ICON_ERROR $job"; done
+for job in "${PASS[@]}"; do echo "  $ICON_DONE  $job"; done
+for job in "${FAIL[@]}"; do echo "  $ICON_ERROR $job"; done
 echo "  Passed: ${#PASS[@]}  Failed: ${#FAIL[@]}"
 
 if [[ ${#JOB_PASS[@]} -gt 0 || ${#JOB_FAIL[@]} -gt 0 ]]; then
     echo ""
     echo "$ICON_GEAR  Post-sync jobs:"
-    for job in "${JOB_PASS[@]:-}"; do echo "  $ICON_DONE  $job"; done
-    for job in "${JOB_FAIL[@]:-}"; do echo "  $ICON_ERROR $job"; done
+    for job in "${JOB_PASS[@]}"; do echo "  $ICON_DONE  $job"; done
+    for job in "${JOB_FAIL[@]}"; do echo "  $ICON_ERROR $job"; done
 fi
 
 TOTAL_FAIL=$(( ${#FAIL[@]} + ${#JOB_FAIL[@]} ))