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

backend/internal/controller/customer/customer_controller.go

@@ -0,0 +1,135 @@
+package customer
+
+import (
+	customerservice "backend/internal/service/customer"
+	"backend/utils"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+// CustomerController 客户控制器 // Logan.Li
+type CustomerController struct {
+	svc *customerservice.CustomerService
+	db  *gorm.DB
+}
+
+// NewCustomerController 创建控制器实例 // Logan.Li
+func NewCustomerController(db *gorm.DB) *CustomerController {
+	return &CustomerController{svc: customerservice.NewCustomerService(db), db: db}
+}
+
+// List 客户列表 // Logan.Li
+func (ctrl *CustomerController) List(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "10"))
+	keyword := c.Query("keyword")
+
+	customers, total, err := ctrl.svc.List(page, pageSize, keyword)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": 500, "message": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 0, "data": gin.H{
+		"list": customers, "total": total, "page": page, "page_size": pageSize,
+		"total_pages": (total + int64(pageSize) - 1) / int64(pageSize),
+	}})
+}
+
+// GetAll 全部客户 // Logan.Li
+func (ctrl *CustomerController) GetAll(c *gin.Context) {
+	customers, err := ctrl.svc.GetAll()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": 500, "message": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 0, "data": customers})
+}
+
+// Get 客户详情 // Logan.Li
+func (ctrl *CustomerController) Get(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 32)
+	customer, err := ctrl.svc.GetByID(uint(id))
+	if err != nil {
+		c.JSON(http.StatusOK, gin.H{"code": 404, "message": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 0, "data": customer})
+}
+
+// Create 创建客户 // Logan.Li
+func (ctrl *CustomerController) Create(c *gin.Context) {
+	var req struct {
+		Name    string `json:"name" binding:"required"`
+		Company string `json:"company"`
+		Email   string `json:"email" binding:"omitempty,email"`
+		Phone   string `json:"phone"`
+		Address string `json:"address"`
+		Notes   string `json:"notes"`
+		Status  *int   `json:"status"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "参数错误: " + err.Error()})
+		return
+	}
+	customer, err := ctrl.svc.Create(req)
+	if err != nil {
+		c.JSON(http.StatusOK, gin.H{"code": 1, "message": err.Error()})
+		return
+	}
+	utils.LogAction(ctrl.db, c, "create", "customer", customer.ID, customer.Name, "", "", "创建客户")
+	c.JSON(http.StatusOK, gin.H{"code": 0, "message": "创建成功", "data": customer})
+}
+
+// Update 更新客户 // Logan.Li
+func (ctrl *CustomerController) Update(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 32)
+	var req struct {
+		Name    string `json:"name"`
+		Company string `json:"company"`
+		Email   string `json:"email" binding:"omitempty,email"`
+		Phone   string `json:"phone"`
+		Address string `json:"address"`
+		Notes   string `json:"notes"`
+		Status  *int   `json:"status"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": 400, "message": "参数错误"})
+		return
+	}
+	customer, err := ctrl.svc.Update(uint(id), req)
+	if err != nil {
+		c.JSON(http.StatusOK, gin.H{"code": 1, "message": err.Error()})
+		return
+	}
+	utils.LogAction(ctrl.db, c, "update", "customer", customer.ID, customer.Name, "", "", "更新客户")
+	c.JSON(http.StatusOK, gin.H{"code": 0, "message": "更新成功", "data": customer})
+}
+
+// Delete 删除客户 // Logan.Li
+func (ctrl *CustomerController) Delete(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 32)
+	if err := ctrl.svc.Delete(uint(id)); err != nil {
+		c.JSON(http.StatusOK, gin.H{"code": 1, "message": err.Error()})
+		return
+	}
+	utils.LogAction(ctrl.db, c, "delete", "customer", uint(id), "", "", "", "删除客户")
+	c.JSON(http.StatusOK, gin.H{"code": 0, "message": "删除成功"})
+}
+
+// UpdateStatus 切换状态 // Logan.Li
+func (ctrl *CustomerController) UpdateStatus(c *gin.Context) {
+	id, _ := strconv.ParseUint(c.Param("id"), 10, 32)
+	var req struct {
+		Status int `json:"status"`
+	}
+	c.ShouldBindJSON(&req)
+	if err := ctrl.svc.UpdateStatus(uint(id), req.Status); err != nil {
+		c.JSON(http.StatusOK, gin.H{"code": 1, "message": err.Error()})
+		return
+	}
+	utils.LogAction(ctrl.db, c, "update_status", "customer", uint(id), "", "", "", "切换客户状态")
+	c.JSON(http.StatusOK, gin.H{"code": 0, "message": "状态更新成功"})
+}