feat: add episode classification enrichment implementation

internal/episodes/service/classifications_test.go

@@ -0,0 +1,32 @@
+package service
+
+import (
+	"testing"
+
+	"mal/integrations/jikan"
+	"mal/internal/domain"
+)
+
+func TestMergeEpisodeClassificationsRestoresFillerAndRecap(t *testing.T) {
+	episodes := []domain.CanonicalEpisode{
+		{Number: 1, Title: "First", HasSub: true},
+		{Number: 2, Title: "Second", HasSub: true},
+		{Number: 3, Title: "Third", HasSub: true},
+	}
+
+	mergeEpisodeClassifications(episodes, []jikan.Episode{
+		{Episode: "1"},
+		{Episode: "2", Filler: true},
+		{Episode: "3", Recap: true},
+	})
+
+	if episodes[0].Filler || episodes[0].Recap {
+		t.Fatalf("episode 1 = %#v", episodes[0])
+	}
+	if !episodes[1].Filler || episodes[1].Recap {
+		t.Fatalf("episode 2 = %#v", episodes[1])
+	}
+	if episodes[2].Filler || !episodes[2].Recap {
+		t.Fatalf("episode 3 = %#v", episodes[2])
+	}
+}