Add Sonarr discovery; wire search commands to all arr adds

- New: Media/playback_aware_sonarr_discovery.sh — two-stage TV show
  discovery using Emby episode play history → TMDB TV recommendations.
  Multi-user aware: diversity score (0-50) is primary seed driver so one
  user binge-watching alone cannot dominate. Per-user episode cap (default 8)
  limits single-user volume contribution. TMDB→TVDB via external_ids for
  reliable Sonarr lookup. monitor=future by default.

- Add to WEEKLY_MAINTENANCE_SCRIPTS; Sonarr discovery config block in
  master.conf (threshold=52, lookback=14d, max_adds=3, user_ep_cap=8).

- Fix: all arr add scripts were not triggering searches after adding.
  Added _radarr_command/_lidarr_command/_sonarr_command helpers and fire
  MoviesSearch/ArtistSearch/SeriesSearch immediately after each successful
  add. Affects: playback_aware_radarr_discovery.sh, emby_to_lidarr_sync.sh,
  emby_to_radarr_sync.sh, emby_to_sonarr_sync.sh.

master.conf

@@ -382,6 +382,7 @@
         "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
+        "Media/playback_aware_sonarr_discovery.sh"      # behavior-driven TV discovery using TMDB recommendations
     )
 
 # Pull updates for all running containers NOT in daily/weekly restart lists.
@@ -950,6 +951,18 @@
     LIDARR_DISCOVERY_REJECT_COOLDOWN=30   # days before re-evaluating a rejected artist
     LIDARR_DISCOVERY_HISTORY="$DATA_DIR/lidarr_discovery_history.db"
 
+# Sonarr discovery settings (playback_aware_sonarr_discovery.sh)
+    SONARR_DISCOVERY_THRESHOLD=52         # score to accept candidate (0-100)
+    SONARR_DISCOVERY_LOOKBACK_DAYS=14     # Emby episode play history window in days (shorter than movies — TV watched more frequently)
+    SONARR_DISCOVERY_MAX_SEEDS=5          # max seed series from Stage 1
+    SONARR_DISCOVERY_MAX_ADDS=3           # max shows to add per run — TV is a larger commitment than movies
+    SONARR_DISCOVERY_MIN_VOTE_COUNT=50    # min TMDB votes (TV has fewer votes than movies at same popularity)
+    SONARR_DISCOVERY_MIN_RATING=65        # min TMDB vote_average × 10 (65 = 6.5/10)
+    SONARR_DISCOVERY_REJECT_COOLDOWN=60   # days before re-evaluating a rejected show
+    SONARR_DISCOVERY_USER_EPISODE_CAP=8   # max episodes any one user contributes to seed volume score
+    SONARR_DISCOVERY_MONITOR_MODE="future" # Sonarr monitor mode on add: future | all | first | latest | none
+    SONARR_DISCOVERY_HISTORY="$DATA_DIR/sonarr_discovery_history.db"
+
 # Radarr discovery shared settings
     RADARR_DISCOVERY_THRESHOLD=52         # score to accept candidate (0-100) — lower than Lidarr since diverse seeds rarely overlap
     RADARR_DISCOVERY_LOOKBACK_DAYS=30     # Emby watch history window in days (movies rewatched less often)