chore: baseline snapshot before moderation-strictness feature

Repo .git was damaged (refs/ missing, index truncated, object store near-empty).
Repaired via git init (rebuilt refs), stale index preserved as .git/index.corrupt-20260910.bak,
then full worktree committed as a rollback baseline.

internal/form/auth.go

@@ -0,0 +1,31 @@
+// Copyright 2022 E99p1ant. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package form
+
+type Register struct {
+	Email          string `valid:"required;email;maxlen:100" label:"电子邮箱" msg:"form.register.email"`
+	Domain         string `valid:"required;alphadash;minlen:3;maxlen:20" label:"个性域名" msg:"form.register.domain"`
+	Name           string `valid:"required;maxlen:20" label:"昵称" msg:"form.register.name"`
+	Password       string `valid:"required;minlen:8;maxlen:30" label:"密码" msg:"form.register.password"`
+	RepeatPassword string `valid:"required;equal:Password" label:"重复密码" msg:"form.register.repeatPassword"`
+	Recaptcha      string `form:"g-recaptcha-response" valid:"required" label:"Recaptcha" msg:"form.register.recaptcha"`
+	Language       string `form:"language" label:"界面语言"` // 可选：注册时选择界面语言，留空使用站点默认
+}
+
+type Login struct {
+	Email     string `valid:"required;email;maxlen:100" label:"电子邮箱" msg:"form.email.required"`
+	Password  string `valid:"required" label:"密码" msg:"form.login.password"`
+	Recaptcha string `form:"g-recaptcha-response" valid:"required" label:"Recaptcha" msg:"form.recaptcha"`
+}
+
+type ForgotPassword struct {
+	Email     string `valid:"required;email;maxlen:100" label:"电子邮箱" msg:"form.email.required"`
+	Recaptcha string `form:"g-recaptcha-response" valid:"required" label:"Recaptcha" msg:"form.recaptcha"`
+}
+
+type RecoverPassword struct {
+	NewPassword    string `valid:"required;minlen:8;maxlen:30" label:"新密码" msg:"form.recover.newPassword"`
+	RepeatPassword string `valid:"required;equal:NewPassword" label:"重复密码" msg:"form.recover.repeatPassword"`
+}