feat: create user, read users, batch delete users

model/user.go

@@ -2,6 +2,6 @@ package model
 
 type User struct {
 	Common
-	Username string `json:"username,omitempty"`
+	Username string `json:"username,omitempty" gorm:"uniqueIndex"`
 	Password string `json:"password,omitempty" gorm:"type:char(72)"`
 }

model/user_api.go

@@ -0,0 +1,6 @@
+package model
+
+type UserForm struct {
+	Username string `json:"username,omitempty"`
+	Password string `json:"password,omitempty" gorm:"type:char(72)"`
+}