feat: add nickname field for user

api/store/model/user.go

@@ -3,6 +3,7 @@ package model
 type User struct {
 	BaseModel
 	Mobile      string
+	Nickname    string
 	Password    string
 	Avatar      string
 	Salt        string // 密码盐

api/store/vo/user.go

@@ -5,6 +5,7 @@ import "chatplus/core/types"
 type User struct {
 	BaseVo
 	Mobile      string               `json:"mobile"`
+	Nickname    string               `json:"nickname"`
 	Avatar      string               `json:"avatar"`
 	Salt        string               `json:"salt"`         // 密码盐
 	TotalTokens int64                `json:"total_tokens"` // 总消耗tokens