init: 后端框架脚手架 (Go + Gin + GORM + MySQL)

- 项目目录结构：backend/ deploy/ schema/ migrations/
- 数据库 Schema：所有建表 SQL，含 hotel_id 多租户隔离
- Go 后端：config、model、handler、service、middleware、router
- 认证：账号密码登录 + JWT（Access + Refresh Token）
- 许可证：HMAC-SHA256 激活码生成 + 设备绑定验证
- 业务模块：商品、仓库、往来单位、入库、出库、库存、盘点
- 库存事务：入库/出库审核时原子更新库存 + 流水记录
- 数据导入：Excel/CSV 批量导入商品、往来单位
- Docker Compose：本地 MySQL + Adminer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/internal/handler/partner.go

@@ -0,0 +1,89 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+
+	"github.com/wangjia/jiu/backend/internal/middleware"
+	"github.com/wangjia/jiu/backend/internal/model"
+)
+
+type PartnerHandler struct {
+	db *gorm.DB
+}
+
+func NewPartnerHandler(db *gorm.DB) *PartnerHandler {
+	return &PartnerHandler{db: db}
+}
+
+func (h *PartnerHandler) List(c *gin.Context) {
+	hotelID := middleware.GetHotelID(c)
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+
+	query := h.db.Model(&model.Partner{}).
+		Where("hotel_id = ? AND deleted_at IS NULL", hotelID)
+
+	if t := c.Query("type"); t != "" {
+		query = query.Where("FIND_IN_SET(?, type)", t)
+	}
+	if kw := c.Query("keyword"); kw != "" {
+		query = query.Where("name LIKE ? OR phone LIKE ?", "%"+kw+"%", "%"+kw+"%")
+	}
+
+	var total int64
+	query.Count(&total)
+
+	var partners []model.Partner
+	query.Offset((page - 1) * pageSize).Limit(pageSize).Order("id DESC").Find(&partners)
+
+	c.JSON(http.StatusOK, gin.H{"data": partners, "total": total, "page": page, "page_size": pageSize})
+}
+
+func (h *PartnerHandler) Create(c *gin.Context) {
+	hotelID := middleware.GetHotelID(c)
+	var p model.Partner
+	if err := c.ShouldBindJSON(&p); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	p.HotelID = hotelID
+	if err := h.db.Create(&p).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusCreated, gin.H{"data": p})
+}
+
+func (h *PartnerHandler) Update(c *gin.Context) {
+	hotelID := middleware.GetHotelID(c)
+	var p model.Partner
+	if err := h.db.Where("id = ? AND hotel_id = ? AND deleted_at IS NULL", c.Param("id"), hotelID).
+		First(&p).Error; err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
+		return
+	}
+	if err := c.ShouldBindJSON(&p); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	p.HotelID = hotelID
+	h.db.Save(&p)
+	c.JSON(http.StatusOK, gin.H{"data": p})
+}
+
+func (h *PartnerHandler) Delete(c *gin.Context) {
+	hotelID := middleware.GetHotelID(c)
+	now := timeNow()
+	result := h.db.Model(&model.Partner{}).
+		Where("id = ? AND hotel_id = ? AND deleted_at IS NULL", c.Param("id"), hotelID).
+		Update("deleted_at", now)
+	if result.RowsAffected == 0 {
+		c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "deleted"})
+}