refactor: 后端包结构重构、去除无用的文件

server/internal/sys/api/form/form.go

@@ -0,0 +1,9 @@
+package form
+
+// 登录表单
+type LoginForm struct {
+	Username string `json:"username" binding:"required"`
+	Password string `binding:"required"`
+	Captcha  string `binding:"required"`
+	Cid      string `binding:"required"`
+}