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

master.conf

@@ -381,6 +381,7 @@
         "Docker_Essentials/docker_update_remaining.sh"  # pull updates for all other containers
         "unRAID_Essentials/clear_logs.sh"               # purge aged logs — Sunday only, low priority
         "Media/playback_aware_lidarr_discovery.sh"      # behavior-driven music discovery using weekly Emby playback history
+        "Media/playback_aware_radarr_discovery.sh"      # behavior-driven movie discovery using TMDB recommendations
     )
 
 # Pull updates for all running containers NOT in daily/weekly restart lists.
@@ -949,6 +950,23 @@
     LIDARR_DISCOVERY_REJECT_COOLDOWN=30   # days before re-evaluating a rejected artist
     LIDARR_DISCOVERY_HISTORY="$DATA_DIR/lidarr_discovery_history.db"
 
+# Radarr discovery shared settings
+    RADARR_DISCOVERY_THRESHOLD=60         # score to accept candidate (0-100) — lower than Lidarr since movie tastes are broader
+    RADARR_DISCOVERY_LOOKBACK_DAYS=30     # Emby watch history window in days (movies rewatched less often)
+    RADARR_DISCOVERY_MAX_SEEDS=5          # max seed movies from Stage 1
+    RADARR_DISCOVERY_MAX_ADDS=5           # max movies to add per run
+    RADARR_DISCOVERY_MIN_VOTE_COUNT=100   # min TMDB votes to be considered a candidate
+    RADARR_DISCOVERY_MIN_RATING=60        # min TMDB vote_average × 10 (60 = 6.0/10)
+    RADARR_DISCOVERY_REJECT_COOLDOWN=60   # days before re-evaluating a rejected movie
+    RADARR_DISCOVERY_SEED_LIBRARIES=("Movies")  # Emby libraries to draw seed movies from
+    RADARR_DISCOVERY_HISTORY="$DATA_DIR/radarr_discovery_history.db"
+
+# Emby → arr sync library allowlists
+# Only these Emby library names will be considered by the sync tools.
+# Names must match exactly as shown in Emby > Dashboard > Libraries.
+    SONARR_EMBY_LIBRARIES=("Anime" "Kids Shows" "Stand-Up Comedy" "TV shows")
+    RADARR_EMBY_LIBRARIES=("Movies" "Kid's Movies")
+
 # Sonarr shared settings
     SONARR_ORPHAN_AGE=7             # days — files must be older than this before eligible for deletion
     SONARR_MAX_DELETE_GB=10         # require --i-know-what-im-doing if deletion exceeds this