feat: add seasons from request details

backend/app/services/snapshot.py

@@ -369,6 +369,38 @@ def _episode_availability(episodes: Any) -> Dict[str, Any]:
     }
 
 
+def _unmonitored_season_options(series: Any, episodes: Any) -> List[Dict[str, int]]:
+    """Describe regular Sonarr seasons that can be added to an existing request."""
+    if not isinstance(series, dict) or not isinstance(series.get("seasons"), list):
+        return []
+    episode_rows = [episode for episode in episodes if isinstance(episode, dict)] if isinstance(episodes, list) else []
+    options: List[Dict[str, int]] = []
+    for season in series["seasons"]:
+        if not isinstance(season, dict) or season.get("monitored") is not False:
+            continue
+        season_number = season.get("seasonNumber")
+        if not isinstance(season_number, int) or season_number <= 0:
+            continue
+        matching = [episode for episode in episode_rows if episode.get("seasonNumber") == season_number]
+        statistics = season.get("statistics") if isinstance(season.get("statistics"), dict) else {}
+        episode_count = statistics.get("totalEpisodeCount")
+        if not isinstance(episode_count, int):
+            episode_count = statistics.get("episodeCount")
+        if not isinstance(episode_count, int):
+            episode_count = len(matching)
+        available = statistics.get("episodeFileCount")
+        if not isinstance(available, int):
+            available = sum(1 for episode in matching if episode.get("hasFile") is True)
+        options.append(
+            {
+                "seasonNumber": season_number,
+                "episodeCount": max(0, episode_count),
+                "available": max(0, available),
+            }
+        )
+    return sorted(options, key=lambda item: item["seasonNumber"])
+
+
 def _summarize_qbit(torrents: List[Dict[str, Any]]) -> Dict[str, Any]:
     if not torrents:
         return {"state": "idle", "message": "0 active downloads."}
@@ -939,6 +971,7 @@ def _build_presentation(
                 "missing": missing,
                 "total": total,
                 "seasons": availability.get("seasons") or [],
+                "unmonitoredSeasons": arr_details.get("unmonitoredSeasons") or [],
                 "missingEpisodes": arr_details.get("missingEpisodes") or {},
             },
             {
@@ -1240,6 +1273,7 @@ async def build_snapshot(request_id: str) -> Snapshot:
                         "state": await read_search_status(sonarr, RequestType.tv, series_id, episodes)
                     }
                     arr_details["availability"] = _episode_availability(episodes)
+                    arr_details["unmonitoredSeasons"] = _unmonitored_season_options(arr_item, episodes)
                     counts = arr_details["availability"]
                     arr_state = "available" if counts.get("total", 0) > 0 and not counts.get("missing") else "added"
                     missing_by_season = _missing_episode_numbers_by_season(episodes)