feat：完善项目

app/common/model/activity_instance.go

@@ -14,6 +14,7 @@ type ActivityInstance struct {
 	ContactMobile string `gorm:"column:contact_mobile;type:varchar(15);default:'';comment:联系方式" json:"contact_mobile"`
 	Image
 	Area
+	Description string                 `gorm:"column:description;type:varchar(255);comment:描述" json:"description"`
 	Industry    string                 `gorm:"column:industry;type:varchar(255);comment:所属领域;行业信息" json:"-"`
 	Amount      float64                `gorm:"column:amount;type:decimal(10,2);default:0;comment:活动收费金额" json:"amount"`
 	Content     string                 `gorm:"column:content;type:text;comment:活动详情" json:"content"`