feat: 完成 opsx-licence 许可证管理平台全栈实现

基于 opsx-web-lite 框架（Go+Gin+Vue3+Element Plus）构建许可证管理服务器，业务域参考 Licence 服务器 Web 版。【后端 - 4层架构】 - 认证：单 Admin 表 + JWT（HS256） - 核心授权域：Product / Customer / License / Activation · License 生成/验证/激活/机器绑定/心跳/续期/吊销 · 客户端契约接口：/api/v1/license/{verify,activate,deactivate,heartbeat} - 定价订单：Plan / Order / 支付网关配置 - 防重复购买：CustomerEntitlement + 幂等支付 webhook + 手动发放 - 分析审计：Dashboard 统计 / Analytics / AuditLog / Setting 管理【前端】 - Dashboard（ECharts 图表）、产品、客户、License、计划、订单、权益、日志、设置 - 9 个完整 CRUD 业务页面 + 登录/布局【部署】 - SQLite + 单二进制（//go:embed 嵌入前端） - 开发：./run.sh start（前端5181/后端9001） - 生产：./run.sh build && ./run.sh binary start - 默认账号：admin/admin Author: Logan.Li
2026-08-07 15:02:00 +08:00
commit 4ae318335c
@@ -0,0 +1,171 @@
+package product
+
+import (
+	"backend/internal/dto"
+	"backend/internal/model"
+	"backend/utils"
+	"errors"
+
+	"gorm.io/gorm"
+)
+
+// ProductService 产品业务逻辑层 // Logan.Li
+type ProductService struct {
+	db *gorm.DB
+}
+
+// NewProductService 创建 service 实例 // Logan.Li
+func NewProductService(db *gorm.DB) *ProductService {
+	return &ProductService{db: db}
+}
+
+// List 分页查询产品 // Logan.Li
+func (s *ProductService) List(page, pageSize int, keyword string) ([]dto.ProductResponse, int64, error) {
+	var products []model.Product
+	var total int64
+
+	query := s.db.Model(&model.Product{})
+	if keyword != "" {
+		query = query.Where("name LIKE ? OR code LIKE ?", "%"+keyword+"%", "%"+keyword+"%")
+	}
+
+	query.Count(&total)
+	if err := query.Order("created_at DESC").
+		Offset((page - 1) * pageSize).Limit(pageSize).
+		Find(&products).Error; err != nil {
+		return nil, 0, err
+	}
+
+	results := make([]dto.ProductResponse, 0, len(products))
+	for _, p := range products {
+		results = append(results, toProductResponse(p))
+	}
+	return results, total, nil
+}
+
+// GetAll 获取全部产品（下拉选项用） // Logan.Li
+func (s *ProductService) GetAll() ([]dto.ProductResponse, error) {
+	var products []model.Product
+	if err := s.db.Where("status = ?", 1).Order("created_at DESC").Find(&products).Error; err != nil {
+		return nil, err
+	}
+	results := make([]dto.ProductResponse, 0, len(products))
+	for _, p := range products {
+		results = append(results, toProductResponse(p))
+	}
+	return results, nil
+}
+
+// GetByID 根据 ID 获取产品 // Logan.Li
+func (s *ProductService) GetByID(id uint) (*dto.ProductResponse, error) {
+	var product model.Product
+	if err := s.db.First(&product, id).Error; err != nil {
+		return nil, errors.New("产品不存在")
+	}
+	resp := toProductResponse(product)
+	return &resp, nil
+}
+
+// Create 创建产品 // Logan.Li
+func (s *ProductService) Create(req dto.ProductCreate) (*dto.ProductResponse, error) {
+	// 检查 code 唯一性 // Logan.Li
+	var count int64
+	s.db.Model(&model.Product{}).Where("code = ?", req.Code).Count(&count)
+	if count > 0 {
+		return nil, errors.New("产品编码已存在")
+	}
+
+	status := 1
+	if req.Status != nil {
+		status = *req.Status
+	}
+	priceModel := req.PriceModel
+	if priceModel == "" {
+		priceModel = "subscription"
+	}
+
+	product := model.Product{
+		Name:        req.Name,
+		Code:        req.Code,
+		Version:     req.Version,
+		Description: req.Description,
+		Features:    utils.FormatFeatures(req.Features),
+		Price:       req.Price,
+		PriceModel:  priceModel,
+		Status:      status,
+	}
+	if err := s.db.Create(&product).Error; err != nil {
+		return nil, errors.New("创建产品失败")
+	}
+	resp := toProductResponse(product)
+	return &resp, nil
+}
+
+// Update 更新产品 // Logan.Li
+func (s *ProductService) Update(id uint, req dto.ProductUpdate) (*dto.ProductResponse, error) {
+	var product model.Product
+	if err := s.db.First(&product, id).Error; err != nil {
+		return nil, errors.New("产品不存在")
+	}
+
+	updates := map[string]interface{}{}
+	if req.Name != "" {
+		updates["name"] = req.Name
+	}
+	if req.Version != "" {
+		updates["version"] = req.Version
+	}
+	updates["description"] = req.Description
+	if req.Features != nil {
+		updates["features"] = utils.FormatFeatures(req.Features)
+	}
+	if req.Price != nil {
+		updates["price"] = *req.Price
+	}
+	if req.PriceModel != "" {
+		updates["price_model"] = req.PriceModel
+	}
+	if req.Status != nil {
+		updates["status"] = *req.Status
+	}
+
+	if err := s.db.Model(&product).Updates(updates).Error; err != nil {
+		return nil, errors.New("更新产品失败")
+	}
+	// 重新查询获取最新数据 // Logan.Li
+	s.db.First(&product, id)
+	resp := toProductResponse(product)
+	return &resp, nil
+}
+
+// Delete 删除产品（软删除） // Logan.Li
+func (s *ProductService) Delete(id uint) error {
+	var count int64
+	s.db.Model(&model.License{}).Where("product_id = ?", id).Count(&count)
+	if count > 0 {
+		return errors.New("该产品下存在 License，无法删除")
+	}
+	return s.db.Delete(&model.Product{}, id).Error
+}
+
+// UpdateStatus 切换产品上下架状态 // Logan.Li
+func (s *ProductService) UpdateStatus(id uint, status int) error {
+	return s.db.Model(&model.Product{}).Where("id = ?", id).Update("status", status).Error
+}
+
+// toProductResponse 模型转响应 DTO // Logan.Li
+func toProductResponse(p model.Product) dto.ProductResponse {
+	return dto.ProductResponse{
+		ID:          p.ID,
+		Name:        p.Name,
+		Code:        p.Code,
+		Version:     p.Version,
+		Description: p.Description,
+		Features:    utils.ParseFeatures(p.Features),
+		Price:       p.Price,
+		PriceModel:  p.PriceModel,
+		Status:      p.Status,
+		CreatedAt:   p.CreatedAt.Format("2006-01-02 15:04:05"),
+		UpdatedAt:   p.UpdatedAt.Format("2006-01-02 15:04:05"),
+	}
+}