refactor(repository): 收敛 model/repository 分层为唯一持久化入口

将 OpenFlare 与平台业务的数据访问从 model 与 apps 直连迁入 repository，
model 仅保留实体与无 IO 规则；补充 code-check 架构守卫与开发规范。

internal/apps/openflare/flared/middleware_test.go

@@ -9,6 +9,8 @@ import (
 	"net/http/httptest"
 	"testing"
 
+	"github.com/Rain-kl/Wavelet/internal/repository"
+
 	db "github.com/Rain-kl/Wavelet/internal/infra/persistence"
 	"github.com/Rain-kl/Wavelet/internal/model"
 	"github.com/Rain-kl/Wavelet/internal/shared/response"
@@ -44,7 +46,7 @@ func seedFlaredNode(t *testing.T, nodeType, accessToken string) *model.OpenFlare
 		NodeType:    nodeType,
 		AccessToken: accessToken,
 	}
-	require.NoError(t, model.CreateOpenFlareNode(ctx, node))
+	require.NoError(t, repository.CreateOpenFlareNode(ctx, node))
 	return node
 }