added season statistics to sonarr series model

code/backend/Cleanuparr.Domain/Entities/Arr/SearchableSeries.cs

@@ -19,4 +19,6 @@ public sealed record SearchableSeries
     public string SeriesType { get; init; } = string.Empty;
 
     public SeriesStatistics? Statistics { get; init; }
+
+    public List<SeriesSeason> Seasons { get; init; } = [];
 }

code/backend/Cleanuparr.Domain/Entities/Arr/SeasonStatistics.cs

@@ -0,0 +1,12 @@
+namespace Cleanuparr.Domain.Entities.Arr;
+
+public sealed record SeasonStatistics
+{
+    public int EpisodeCount { get; init; }
+
+    public int EpisodeFileCount { get; init; }
+
+    public int TotalEpisodeCount { get; init; }
+
+    public DateTimeOffset? NextAiring { get; init; }
+}

code/backend/Cleanuparr.Domain/Entities/Arr/SeriesSeason.cs

@@ -0,0 +1,10 @@
+namespace Cleanuparr.Domain.Entities.Arr;
+
+public sealed record SeriesSeason
+{
+    public int SeasonNumber { get; init; }
+
+    public bool Monitored { get; init; }
+
+    public SeasonStatistics? Statistics { get; init; }
+}

code/backend/Cleanuparr.Infrastructure.Tests/Features/Arr/SonarrClientTests.cs

@@ -346,6 +346,57 @@ public class SonarrClientTests
         request.Headers.GetValues("x-api-key").ShouldHaveSingleItem().ShouldBe("api-key");
     }
 
+    [Fact]
+    public async Task StreamAllSeriesAsync_ReadsSeasonStatistics()
+    {
+        // Arrange
+        const string body = """
+            [
+              {
+                "id": 1,
+                "title": "Show",
+                "seasons": [
+                  {
+                    "seasonNumber": 1,
+                    "monitored": true,
+                    "statistics": { "episodeCount": 10, "episodeFileCount": 8, "totalEpisodeCount": 10 }
+                  },
+                  {
+                    "seasonNumber": 2,
+                    "monitored": false,
+                    "statistics": { "nextAiring": "2026-11-01T20:00:00Z", "episodeCount": 3, "episodeFileCount": 1, "totalEpisodeCount": 12 }
+                  }
+                ]
+              }
+            ]
+            """;
+        _httpMessageHandler.SetupResponse((_, _) => Task.FromResult(new HttpResponseMessage(HttpStatusCode.OK)
+        {
+            Content = new StringContent(body, Encoding.UTF8, "application/json"),
+        }));
+
+        // Act
+        List<SearchableSeries> result = [];
+        await foreach (SearchableSeries series in _client.StreamAllSeriesAsync(_arrInstance))
+        {
+            result.Add(series);
+        }
+
+        // Assert
+        List<SeriesSeason> seasons = result.ShouldHaveSingleItem().Seasons;
+        seasons.Count.ShouldBe(2);
+        seasons[0].SeasonNumber.ShouldBe(1);
+        seasons[0].Monitored.ShouldBeTrue();
+        seasons[0].Statistics!.EpisodeCount.ShouldBe(10);
+        seasons[0].Statistics!.EpisodeFileCount.ShouldBe(8);
+        seasons[0].Statistics!.TotalEpisodeCount.ShouldBe(10);
+        seasons[0].Statistics!.NextAiring.ShouldBeNull();
+        seasons[1].SeasonNumber.ShouldBe(2);
+        seasons[1].Monitored.ShouldBeFalse();
+        seasons[1].Statistics!.EpisodeCount.ShouldBe(3);
+        seasons[1].Statistics!.NextAiring.ShouldBe(new DateTimeOffset(2026, 11, 1, 20, 0, 0, TimeSpan.Zero));
+    }
+
     [Fact]
     public async Task StreamAllSeriesAsync_NullBody_ReturnsEmpty()
     {