chore(init): 初始化解忧商行项目并完成 Phase 0 基座

backend/internal/modules/systemconfig/repository_test.go

@@ -0,0 +1,65 @@
+package systemconfig
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"testing"
+
+	"hfb_sys/backend/internal/database"
+	"hfb_sys/backend/internal/model"
+
+	"gorm.io/gorm"
+)
+
+func newTestSystemConfigRepo(t *testing.T) (*Repository, *gorm.DB) {
+	t.Helper()
+	db := database.NewTestDB()
+	if err := database.AutoMigrateIfMissing(db, &model.SystemConfig{}); err != nil {
+		t.Fatalf("自动迁移 SystemConfig 失败: %v", err)
+	}
+	return NewRepository(db), db
+}
+
+func TestRepositoryEnsureDefaultsConcurrency(t *testing.T) {
+	repo, _ := newTestSystemConfigRepo(t)
+	ctx := context.Background()
+
+	// 并发 20 个 goroutine 调用 EnsureDefaults
+	var wg sync.WaitGroup
+	errCh := make(chan error, 20)
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			if err := repo.EnsureDefaults(ctx); err != nil {
+				errCh <- err
+			}
+		}()
+	}
+	wg.Wait()
+	close(errCh)
+
+	for err := range errCh {
+		if err != nil {
+			t.Fatalf("并发 EnsureDefaults 失败: %v", err)
+		}
+	}
+
+	// 再次并发调用 FindValue，验证 initialized 为 true 时直接走只读路径
+	for i := 0; i < 20; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			val, err := repo.FindValue(ctx, "handoff.owner_submit_timeout_minutes")
+			if err != nil {
+				errCh <- err
+				return
+			}
+			if val != "30" {
+				errCh <- fmt.Errorf("got %s, want 30", val)
+			}
+		}()
+	}
+	wg.Wait()
+}