fix: 稳定字典种子外键生成

src/Infrastructure/TakeoutSaaS.Infrastructure/App/Persistence/AppDataSeeder.cs

@@ -318,6 +318,12 @@ public sealed class AppDataSeeder(
         long tenantId,
         CancellationToken cancellationToken)
     {
+        // 确保分组已持久化以获取正确的主键，避免 FK 约束报错。
+        if (!dbContext.Entry(group).IsKeySet || group.Id == 0)
+        {
+            await dbContext.SaveChangesAsync(cancellationToken);
+        }
+
         var materializedItems = seedItems
             .Where(item => !string.IsNullOrWhiteSpace(item.Key) && !string.IsNullOrWhiteSpace(item.Value))
             .ToList();