fix(supply-api): 修复编译错误和测试问题

- 添加 ErrNotFound 和 ErrConcurrencyConflict 错误定义
- 修复 pgx.NullTime 替换为 *time.Time
- 修复 db.go 事务类型 (pgx.Tx vs pgxpool.Tx)
- 移除未使用的导入和变量
- 修复 NewSupplyAPI 调用参数
- 修复中间件链路 handler 类型问题
- 修复适配器类型引用 (storage.InMemoryAccountStore 等)
- 所有测试通过

Test: go test ./...

supply-api/internal/repository/db.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"lijiaoqiao/supply-api/internal/config"
 )
@@ -69,7 +70,7 @@ type Transaction interface {
 }
 
 type txWrapper struct {
-	tx pgxpool.Tx
+	tx pgx.Tx
 }
 
 func (t *txWrapper) Commit(ctx context.Context) error {

supply-api/internal/repository/errors.go

@@ -0,0 +1,12 @@
+package repository
+
+import "errors"
+
+// 仓储层错误定义
+var (
+	// ErrNotFound 资源不存在
+	ErrNotFound = errors.New("resource not found")
+
+	// ErrConcurrencyConflict 并发冲突（乐观锁失败）
+	ErrConcurrencyConflict = errors.New("concurrency conflict: resource was modified by another transaction")
+)

supply-api/internal/repository/idempotency.go

@@ -16,8 +16,8 @@ type IdempotencyStatus string
 
 const (
 	IdempotencyStatusProcessing IdempotencyStatus = "processing"
-	IdempotencyStatusSucceeded IdempotencyStatus = "succeeded"
-	IdempotencyStatusFailed    IdempotencyStatus = "failed"
+	IdempotencyStatusSucceeded  IdempotencyStatus = "succeeded"
+	IdempotencyStatusFailed     IdempotencyStatus = "failed"
 )
 
 // IdempotencyRecord 幂等记录

supply-api/internal/repository/package.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"net/netip"
 	"time"
 
 	"github.com/jackc/pgx/v5"
@@ -84,7 +83,7 @@ func (r *PackageRepository) GetByID(ctx context.Context, supplierID, id int64) (
 	`
 
 	pkg := &domain.Package{}
-	var startAt, endAt pgx.NullTime
+	var startAt, endAt *time.Time
 	err := r.pool.QueryRow(ctx, query, id, supplierID).Scan(
 		&pkg.ID, &pkg.SupplierID, &pkg.SupplierID, &pkg.Platform, &pkg.Model,
 		&pkg.TotalQuota, &pkg.AvailableQuota, &pkg.SoldQuota, &pkg.ReservedQuota,
@@ -103,11 +102,11 @@ func (r *PackageRepository) GetByID(ctx context.Context, supplierID, id int64) (
 		return nil, fmt.Errorf("failed to get package: %w", err)
 	}
 
-	if startAt.Valid {
-		pkg.StartAt = startAt.Time
+	if startAt != nil {
+		pkg.StartAt = *startAt
 	}
-	if endAt.Valid {
-		pkg.EndAt = endAt.Time
+	if endAt != nil {
+		pkg.EndAt = *endAt
 	}
 
 	return pkg, nil

supply-api/internal/repository/settlement.go

@@ -63,7 +63,7 @@ func (r *SettlementRepository) GetByID(ctx context.Context, supplierID, id int64
 	`
 
 	s := &domain.Settlement{}
-	var paidAt pgx.NullTime
+	var paidAt *time.Time
 	err := r.pool.QueryRow(ctx, query, id, supplierID).Scan(
 		&s.ID, &s.SettlementNo, &s.SupplierID, &s.TotalAmount, &s.FeeAmount, &s.NetAmount,
 		&s.Status, &s.PaymentMethod, &s.PaymentAccount,
@@ -79,8 +79,8 @@ func (r *SettlementRepository) GetByID(ctx context.Context, supplierID, id int64
 		return nil, fmt.Errorf("failed to get settlement: %w", err)
 	}
 
-	if paidAt.Valid {
-		s.PaidAt = &paidAt.Time
+	if paidAt != nil {
+		s.PaidAt = paidAt
 	}
 
 	return s, nil