chore: 更新依赖、配置和代码生成

主要更新：
- 更新 go.mod/go.sum 依赖
- 重新生成 Ent ORM 代码
- 更新 Wire 依赖注入配置
- 添加 docker-compose.override.yml 到 .gitignore
- 更新 README 文档（Simple Mode 说明和已知问题）
- 清理调试日志
- 其他代码优化和格式修复

backend/internal/repository/allowed_groups_contract_integration_test.go

@@ -80,7 +80,7 @@ func TestUserRepository_RemoveGroupFromAllowedGroups_RemovesAllOccurrences(t *te
 	require.NotContains(t, u2After.AllowedGroups, targetGroup.ID)
 }
 
-func TestGroupRepository_DeleteCascade_RemovesAllowedGroupsAndClearsAPIKeys(t *testing.T) {
+func TestGroupRepository_DeleteCascade_RemovesAllowedGroupsAndClearsApiKeys(t *testing.T) {
 	ctx := context.Background()
 	tx := testEntTx(t)
 	entClient := tx.Client()
@@ -98,7 +98,7 @@ func TestGroupRepository_DeleteCascade_RemovesAllowedGroupsAndClearsAPIKeys(t *t
 
 	userRepo := newUserRepositoryWithSQL(entClient, tx)
 	groupRepo := newGroupRepositoryWithSQL(entClient, tx)
-	apiKeyRepo := NewAPIKeyRepository(entClient)
+	apiKeyRepo := NewApiKeyRepository(entClient)
 
 	u := &service.User{
 		Email:         uniqueTestValue(t, "cascade-user") + "@example.com",
@@ -110,7 +110,7 @@ func TestGroupRepository_DeleteCascade_RemovesAllowedGroupsAndClearsAPIKeys(t *t
 	}
 	require.NoError(t, userRepo.Create(ctx, u))
 
-	key := &service.APIKey{
+	key := &service.ApiKey{
 		UserID:  u.ID,
 		Key:     uniqueTestValue(t, "sk-test-delete-cascade"),
 		Name:    "test key",