feat: add jikan cache stats query

integrations/jikan/client_test.go

@@ -86,6 +86,33 @@ func TestGetWithCacheAllowsEmptySearchResults(t *testing.T) {
 	}
 }
 
+func TestGetJikanCacheStatsCountsRowsAndExpiry(t *testing.T) {
+	sqlDB := newTestCacheDB(t)
+	defer func() {
+		if err := sqlDB.Close(); err != nil {
+			t.Errorf("close sqlite: %v", err)
+		}
+	}()
+
+	oldest := time.Date(2026, 6, 20, 12, 0, 0, 0, time.UTC)
+	insertCachedResponse(t, sqlDB, "expired", TopAnimeResponse{Data: []Anime{{MalID: 1}}}, oldest)
+	insertCachedResponse(t, sqlDB, "fresh", TopAnimeResponse{Data: []Anime{{MalID: 2}}}, time.Now().Add(time.Hour))
+
+	stats, err := db.New(sqlDB).GetJikanCacheStats(context.Background())
+	if err != nil {
+		t.Fatalf("GetJikanCacheStats: %v", err)
+	}
+	if stats.TotalRows != 2 {
+		t.Fatalf("TotalRows = %d, want 2", stats.TotalRows)
+	}
+	if stats.ExpiredRows != 1 {
+		t.Fatalf("ExpiredRows = %d, want 1", stats.ExpiredRows)
+	}
+	if stats.OldestExpiresAtSeconds != oldest.Unix() {
+		t.Fatalf("OldestExpiresAtSeconds = %d, want %d", stats.OldestExpiresAtSeconds, oldest.Unix())
+	}
+}
+
 func newTestCacheDB(t *testing.T) *sql.DB {
 	t.Helper()
 	ctx := context.Background()