feat: arr-native distributed media sync + config architecture fixes

Arr sync (new):
- Media/arr_sync.sh — full mesh bidirectional sync across all HOST* nodes
  - Lidarr (MusicBrainz), Sonarr (TVDB), Radarr (TMDB) all handled in one script
  - Remote API keys read live from config.xml via SSH — never stored in conf files
  - Shared blocklist (DATA_DIR/arr_sync_blocklist.tsv) merged from all nodes at runtime
  - Graceful skip if arr not configured locally or not reachable on a remote node
  - --blocklist-add / --blocklist-remove / --blocklist-list management flags
- daily_sync_maintenance.sh — arr sync runs as explicit phase before rsync
- partnership_onboard.sh — Step 3 bootstraps merged library on both sides at onboard
- master.conf — ARR_SYNC_* config block, DOCKER_APPDATA_BASE

Rsync / cleanup:
- DEFAULT_RSYNC_OPTS — removed --delete; arr_cleanup.sh owns orphan enforcement
- lidarr_cleanup.sh — removed HOST1-only guard; runs on any node with Lidarr configured

Config architecture:
- HOST1/HOST2 hostnames moved from master_host*.conf → master.conf (not credentials)
- Sparse checkout now works correctly: each server only needs its own host conf
- detect_hosts() still resolves MY_ID + REMOTE_ID via master.conf hostname values

Bug fix:
- common.sh line 493 — watchdog toggle eval had broken quoting; all SYS_WATCHDOG_CHECK_*
  globals were silently set to empty instead of their configured values

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

Media/radarr_cleanup.sh

@@ -164,8 +164,7 @@ if [[ ! -d "$RADARR_MOVIES_ROOT" ]]; then
     exit 1
 fi
 
-log "Radarr URL:   $RADARR_URL"
-log "Movies root:  $RADARR_MOVIES_ROOT"
+echo "  $MY_ID ($LOCAL_SERVER_NAME) — $RADARR_URL"
 
 [[ "$DRY_RUN" == true ]]      && warn "DRY RUN — no files will be deleted"
 [[ "$I_KNOW" == true ]]       && warn "OVERRIDE — --i-know-what-im-doing active"
@@ -298,7 +297,7 @@ fi
 # Safety Layer 3 — API version check
 check_arr_version "$RADARR_URL" "$RADARR_API_KEY" "v3" "$RADARR_VERSION_MAJOR" "Radarr" || exit 1
 
-log "Querying Radarr API: $RADARR_URL"
+echo "  Querying Radarr API..."
 
 # Fetch all movies
 MOVIES_RESPONSE=$(radarr_api "movie") || {
@@ -363,16 +362,14 @@ if [[ "$TRACKED_COUNT" -eq 0 ]]; then
     exit 1
 fi
 
-warn "Radarr tracks $TRACKED_COUNT movie files across $MOVIE_COUNT movies"
+echo "  $MOVIE_COUNT movies | $TRACKED_COUNT tracked movie files"
 
 # ==============================================================================================
 # ━━━ Scan Movies Root ━━━
 # ==============================================================================================
 echo ""
 echo "━━━ $ICON_CLEAN Scanning Movies Root ━━━"
-log "Root:       $RADARR_MOVIES_ROOT"
-log "Orphan age: ${RADARR_ORPHAN_AGE} days"
-log "Protected:  ${RADARR_PROTECTED_PATTERNS[*]}"
+echo "  Root: $RADARR_MOVIES_ROOT | Orphan age: ${RADARR_ORPHAN_AGE} days"
 echo ""
 
 START=$(date +%s)