feat: 新增微信参数配置模块（Model、DTO、Store、Service）

- wechat_config.go: WechatConfig GORM 模型，含 ProviderTypeWechat/Fuiou 常量
- wechat_config_dto.go: Create/Update/List 请求 DTO，响应 DTO 含脱敏逻辑
- wechat_config_store.go: CRUD、GetActive、ActivateInTx（事务内唯一激活）、软删除保护查询
- service.go: 业务逻辑，按渠道校验必填字段、Redis 缓存管理（wechat:config:active）、删除保护、审计日志

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/store/postgres/wechat_config_store.go

@@ -0,0 +1,145 @@
+package postgres
+
+import (
+	"context"
+
+	"github.com/break/junhong_cmp_fiber/internal/model"
+	"github.com/break/junhong_cmp_fiber/internal/store"
+	"github.com/redis/go-redis/v9"
+	"gorm.io/gorm"
+)
+
+// WechatConfigStore 微信参数配置数据访问层
+type WechatConfigStore struct {
+	db  *gorm.DB
+	rdb *redis.Client
+}
+
+// NewWechatConfigStore 创建微信参数配置 Store 实例
+func NewWechatConfigStore(db *gorm.DB, rdb *redis.Client) *WechatConfigStore {
+	return &WechatConfigStore{db: db, rdb: rdb}
+}
+
+// Create 创建微信参数配置
+func (s *WechatConfigStore) Create(ctx context.Context, config *model.WechatConfig) error {
+	return s.db.WithContext(ctx).Create(config).Error
+}
+
+// GetByID 根据 ID 获取配置（遵循软删除）
+func (s *WechatConfigStore) GetByID(ctx context.Context, id uint) (*model.WechatConfig, error) {
+	var config model.WechatConfig
+	if err := s.db.WithContext(ctx).First(&config, id).Error; err != nil {
+		return nil, err
+	}
+	return &config, nil
+}
+
+// GetByIDUnscoped 根据 ID 获取配置（包含已软删除的记录，用于回调处理）
+func (s *WechatConfigStore) GetByIDUnscoped(ctx context.Context, id uint) (*model.WechatConfig, error) {
+	var config model.WechatConfig
+	if err := s.db.WithContext(ctx).Unscoped().First(&config, id).Error; err != nil {
+		return nil, err
+	}
+	return &config, nil
+}
+
+// List 查询配置列表，支持按 provider_type 和 is_active 过滤
+func (s *WechatConfigStore) List(ctx context.Context, opts *store.QueryOptions, filters map[string]interface{}) ([]*model.WechatConfig, int64, error) {
+	var configs []*model.WechatConfig
+	var total int64
+
+	query := s.db.WithContext(ctx).Model(&model.WechatConfig{})
+
+	if providerType, ok := filters["provider_type"].(string); ok && providerType != "" {
+		query = query.Where("provider_type = ?", providerType)
+	}
+	if isActive, ok := filters["is_active"].(*bool); ok && isActive != nil {
+		query = query.Where("is_active = ?", *isActive)
+	}
+
+	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(&configs).Error; err != nil {
+		return nil, 0, err
+	}
+
+	return configs, total, nil
+}
+
+// Update 更新微信参数配置
+func (s *WechatConfigStore) Update(ctx context.Context, config *model.WechatConfig) error {
+	return s.db.WithContext(ctx).Save(config).Error
+}
+
+// SoftDelete 软删除微信参数配置
+func (s *WechatConfigStore) SoftDelete(ctx context.Context, id uint) error {
+	return s.db.WithContext(ctx).Delete(&model.WechatConfig{}, id).Error
+}
+
+// GetActive 获取当前激活的配置
+// 返回 gorm.ErrRecordNotFound 如果没有激活的配置
+func (s *WechatConfigStore) GetActive(ctx context.Context) (*model.WechatConfig, error) {
+	var config model.WechatConfig
+	if err := s.db.WithContext(ctx).Where("is_active = ? AND deleted_at IS NULL", true).First(&config).Error; err != nil {
+		return nil, err
+	}
+	return &config, nil
+}
+
+// ActivateInTx 在事务内激活指定配置（先停用所有，再激活指定记录）
+func (s *WechatConfigStore) ActivateInTx(ctx context.Context, tx *gorm.DB, id uint) error {
+	// 先停用所有激活的配置
+	if err := tx.WithContext(ctx).Model(&model.WechatConfig{}).
+		Where("is_active = ?", true).
+		Update("is_active", false).Error; err != nil {
+		return err
+	}
+	// 再激活指定配置
+	return tx.WithContext(ctx).Model(&model.WechatConfig{}).
+		Where("id = ?", id).
+		Update("is_active", true).Error
+}
+
+// DB 返回底层数据库连接，用于事务操作
+func (s *WechatConfigStore) DB() *gorm.DB {
+	return s.db
+}
+
+// Deactivate 停用指定配置
+func (s *WechatConfigStore) Deactivate(ctx context.Context, id uint) error {
+	return s.db.WithContext(ctx).Model(&model.WechatConfig{}).
+		Where("id = ?", id).
+		Update("is_active", false).Error
+}
+
+// CountPendingOrdersByConfigID 统计指定配置的待支付订单数
+func (s *WechatConfigStore) CountPendingOrdersByConfigID(ctx context.Context, configID uint) (int64, error) {
+	var count int64
+	err := s.db.WithContext(ctx).
+		Table("tb_order").
+		Where("payment_config_id = ? AND payment_status = ? AND deleted_at IS NULL", configID, 1).
+		Count(&count).Error
+	return count, err
+}
+
+// CountPendingRechargesByConfigID 统计指定配置的待支付充值记录数
+func (s *WechatConfigStore) CountPendingRechargesByConfigID(ctx context.Context, configID uint) (int64, error) {
+	var count int64
+	err := s.db.WithContext(ctx).
+		Table("tb_asset_recharge_record").
+		Where("payment_config_id = ? AND status = ? AND deleted_at IS NULL", configID, 1).
+		Count(&count).Error
+	return count, err
+}