Add Radarr discovery + tighten arr sync filters

- playback_aware_radarr_discovery.sh: new two-stage movie discovery
  using recently watched Emby movies as seeds and TMDB recommendations
  as the similarity engine; scores on recency + rating + vote count;
  adds HOST*_TMDB_API_KEY alias to detect_hosts() in common.sh

- emby_to_sonarr_sync.sh: restrict to SONARR_EMBY_LIBRARIES allowlist
  (Anime, Kids Shows, Stand-Up Comedy, TV shows) — excludes Youtube
  and Recorded Sports libraries; add garbage title filter for multi-
  season folder names (S01-S03) and bare bracket tags ([Prof])

- emby_to_radarr_sync.sh: add _is_episode_title filter to block anime
  episode files stored in Movies library (underscore/dot patterns,
  fansub bracket format, episode markers, codec metadata strings)

- emby_to_lidarr_sync.sh: add U+FFFD Unicode replacement character
  filter alongside the existing ASCII ? filter for encoding corruption

- master.conf: RADARR_DISCOVERY_* settings, SONARR/RADARR_EMBY_LIBRARIES
  allowlists, Radarr discovery added to WEEKLY_MAINTENANCE_SCRIPTS

Tools/emby_to_sonarr_sync.sh

@@ -100,6 +100,15 @@ _sonarr_post() {
         "${SONARR_URL}/api/v3/series" 2>/dev/null
 }
 
+# Garbage title filter — catches multi-season folder names and bare fansub tags.
+_is_garbage_title() {
+    local t="$1"
+    [[ "$t" =~ S[0-9]{2}-S[0-9]{2} ]]          && return 0  # Fruits Basket S01-S03
+    [[ "$t" =~ ^\[.*\]$ ]]                       && return 0  # [Prof] bare bracket tag
+    [[ "$t" == *$'\xef\xbf\xbd'* || "$t" == *"?"* ]] && return 0  # encoding corruption
+    return 1
+}
+
 # ==============================================================================================
 # ━━━ Fetch Emby Series Library ━━━
 # ==============================================================================================
@@ -111,17 +120,33 @@ echo "$ICON_HOST $MY_ID ($LOCAL_SERVER_NAME)"
 echo ""
 echo "━━━ $ICON_SYNC Emby Series Library ━━━"
 
-EMBY_SERIES_JSON=$(_emby_api "Items?IncludeItemTypes=Series&Recursive=true&Fields=ProviderIds&Limit=5000") || {
-    error "Could not fetch Emby series"
+if [[ "${#SONARR_EMBY_LIBRARIES[@]}" -eq 0 ]]; then
+    error "SONARR_EMBY_LIBRARIES not configured — check master.conf"
     exit 1
-}
+fi
+
+# Fetch library list and resolve names → ItemIds
+LIBRARIES_JSON=$(_emby_api "Library/VirtualFolders") || { error "Could not fetch Emby libraries"; exit 1; }
 
 declare -A EMBY_SERIES  # name → tvdb_id (empty string if none)
 
-while IFS='|' read -r name tvdb_id; do
-    [[ -z "$name" || "$name" == "null" ]] && continue
-    EMBY_SERIES["$name"]="$tvdb_id"
-done < <(echo "$EMBY_SERIES_JSON" | jq -r '.Items[] | [.Name, (.ProviderIds.Tvdb // "")] | join("|")' 2>/dev/null)
+for lib_name in "${SONARR_EMBY_LIBRARIES[@]}"; do
+    lib_id=$(echo "$LIBRARIES_JSON" | jq -r --arg n "$lib_name" '.[] | select(.Name == $n) | .ItemId' 2>/dev/null)
+    if [[ -z "$lib_id" ]]; then
+        warn "Emby library not found: $lib_name"
+        continue
+    fi
+    log "Scanning library: $lib_name (ItemId: $lib_id)"
+    LIB_JSON=$(_emby_api "Items?ParentId=${lib_id}&IncludeItemTypes=Series&Recursive=true&Fields=ProviderIds&Limit=5000") || {
+        warn "Could not fetch series from library: $lib_name"
+        continue
+    }
+    while IFS='|' read -r name tvdb_id; do
+        [[ -z "$name" || "$name" == "null" ]] && continue
+        _is_garbage_title "$name" && { log "  $ICON_SKIP Skipping garbage title: $name"; continue; }
+        EMBY_SERIES["$name"]="$tvdb_id"
+    done < <(echo "$LIB_JSON" | jq -r '.Items[] | [.Name, (.ProviderIds.Tvdb // "")] | join("|")' 2>/dev/null)
+done
 
 EMBY_COUNT=${#EMBY_SERIES[@]}
 log "$EMBY_COUNT series in Emby library"