feat: 实现运营商模块重构，添加冗余字段优化查询性能

主要变更：
- 新增 Carrier CRUD API（创建、列表、详情、更新、删除、状态更新）
- IotCard/IotCardImportTask 添加 carrier_type/carrier_name 冗余字段
- 移除 Carrier 表的 channel_name/channel_code 字段
- 查询时直接使用冗余字段，避免 JOIN Carrier 表
- 添加数据库迁移脚本（000021-000023）
- 添加单元测试和集成测试
- 同步更新 OpenAPI 文档和 specs

internal/store/postgres/carrier_store.go

@@ -0,0 +1,83 @@
+package postgres
+
+import (
+	"context"
+
+	"gorm.io/gorm"
+
+	"github.com/break/junhong_cmp_fiber/internal/model"
+	"github.com/break/junhong_cmp_fiber/internal/store"
+)
+
+type CarrierStore struct {
+	db *gorm.DB
+}
+
+func NewCarrierStore(db *gorm.DB) *CarrierStore {
+	return &CarrierStore{db: db}
+}
+
+func (s *CarrierStore) Create(ctx context.Context, carrier *model.Carrier) error {
+	return s.db.WithContext(ctx).Create(carrier).Error
+}
+
+func (s *CarrierStore) GetByID(ctx context.Context, id uint) (*model.Carrier, error) {
+	var carrier model.Carrier
+	if err := s.db.WithContext(ctx).First(&carrier, id).Error; err != nil {
+		return nil, err
+	}
+	return &carrier, nil
+}
+
+func (s *CarrierStore) GetByCode(ctx context.Context, code string) (*model.Carrier, error) {
+	var carrier model.Carrier
+	if err := s.db.WithContext(ctx).Where("carrier_code = ?", code).First(&carrier).Error; err != nil {
+		return nil, err
+	}
+	return &carrier, nil
+}
+
+func (s *CarrierStore) Update(ctx context.Context, carrier *model.Carrier) error {
+	return s.db.WithContext(ctx).Save(carrier).Error
+}
+
+func (s *CarrierStore) Delete(ctx context.Context, id uint) error {
+	return s.db.WithContext(ctx).Delete(&model.Carrier{}, id).Error
+}
+
+func (s *CarrierStore) List(ctx context.Context, opts *store.QueryOptions, filters map[string]interface{}) ([]*model.Carrier, int64, error) {
+	var carriers []*model.Carrier
+	var total int64
+
+	query := s.db.WithContext(ctx).Model(&model.Carrier{})
+
+	if carrierType, ok := filters["carrier_type"].(string); ok && carrierType != "" {
+		query = query.Where("carrier_type = ?", carrierType)
+	}
+	if carrierName, ok := filters["carrier_name"].(string); ok && carrierName != "" {
+		query = query.Where("carrier_name LIKE ?", "%"+carrierName+"%")
+	}
+	if status, ok := filters["status"]; ok {
+		query = query.Where("status = ?", status)
+	}
+
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	if opts == nil {
+		opts = store.DefaultQueryOptions()
+	}
+	offset := (opts.Page - 1) * opts.PageSize
+	query = query.Offset(offset).Limit(opts.PageSize)
+
+	if opts.OrderBy != "" {
+		query = query.Order(opts.OrderBy)
+	}
+
+	if err := query.Find(&carriers).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return carriers, total, nil
+}