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_radarr_sync.sh

@@ -100,6 +100,21 @@ _radarr_post() {
         "${RADARR_URL}/api/v3/movie" 2>/dev/null
 }
 
+# Episode/garbage title filter — catches anime episodes stored as individual files
+# in the Movies library, fansub release names, and codec metadata strings.
+_is_episode_title() {
+    local t="$1"
+    [[ "$t" == *"_-_"* ]]                                          && return 0  # NANA_-_01_
+    [[ "$t" == *".-."* ]]                                          && return 0  # Fractale.-.01
+    [[ "$t" =~ ^\[.*\]\[.*\] ]]                                    && return 0  # [Title][NNN][...]
+    [[ "$t" =~ [[:space:]]'-'[[:space:]][0-9]{2,3}$ ]]             && return 0  # Title - 001
+    [[ "$t" =~ [[:space:]]E[0-9]{2,3}([[:space:]]|\[) ]]          && return 0  # Title E01 [group]
+    [[ "${t^^}" == *"HEVC"* ]]                                     && return 0  # codec metadata
+    [[ "$t" == *"(TMDB:"* ]]                                       && return 0  # codec metadata
+    [[ "$t" == *$'\xef\xbf\xbd'* || "$t" == *"?"* ]]              && return 0  # encoding corruption
+    return 1
+}
+
 # ==============================================================================================
 # ━━━ Fetch Emby Movie Library ━━━
 # ==============================================================================================
@@ -120,6 +135,7 @@ declare -A EMBY_MOVIES  # name → tmdb_id (empty string if none)
 
 while IFS='|' read -r name tmdb_id; do
     [[ -z "$name" || "$name" == "null" ]] && continue
+    _is_episode_title "$name" && { log "  $ICON_SKIP Skipping episode/garbage: $name"; continue; }
     EMBY_MOVIES["$name"]="$tmdb_id"
 done < <(echo "$EMBY_MOVIES_JSON" | jq -r '.Items[] | [.Name, (.ProviderIds.Tmdb // "")] | join("|")' 2>/dev/null)