feat(promo-code): complete promo code feature implementation

- Add promo_code_enabled field to SystemSettings and PublicSettings DTOs
- Add promo code validation in registration flow
- Add admin settings UI for promo code configuration
- Add i18n translations for promo code feature

backend/internal/service/auth_service.go

@@ -153,8 +153,8 @@ func (s *AuthService) RegisterWithVerification(ctx context.Context, email, passw
 		return "", nil, ErrServiceUnavailable
 	}
 
-	// 应用优惠码（如果提供）
-	if promoCode != "" && s.promoService != nil {
+	// 应用优惠码（如果提供且功能已启用）
+	if promoCode != "" && s.promoService != nil && s.settingService != nil && s.settingService.IsPromoCodeEnabled(ctx) {
 		if err := s.promoService.ApplyPromoCode(ctx, user.ID, promoCode); err != nil {
 			// 优惠码应用失败不影响注册，只记录日志
 			log.Printf("[Auth] Failed to apply promo code for user %d: %v", user.ID, err)

backend/internal/service/domain_constants.go

@@ -71,6 +71,7 @@ const (
 	// 注册设置
 	SettingKeyRegistrationEnabled = "registration_enabled" // 是否开放注册
 	SettingKeyEmailVerifyEnabled  = "email_verify_enabled" // 是否开启邮件验证
+	SettingKeyPromoCodeEnabled    = "promo_code_enabled"   // 是否启用优惠码功能
 
 	// 邮件服务设置
 	SettingKeySMTPHost     = "smtp_host"      // SMTP服务器地址

backend/internal/service/setting_service.go

@@ -60,6 +60,7 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 	keys := []string{
 		SettingKeyRegistrationEnabled,
 		SettingKeyEmailVerifyEnabled,
+		SettingKeyPromoCodeEnabled,
 		SettingKeyTurnstileEnabled,
 		SettingKeyTurnstileSiteKey,
 		SettingKeySiteName,
@@ -88,6 +89,7 @@ func (s *SettingService) GetPublicSettings(ctx context.Context) (*PublicSettings
 	return &PublicSettings{
 		RegistrationEnabled: settings[SettingKeyRegistrationEnabled] == "true",
 		EmailVerifyEnabled:  settings[SettingKeyEmailVerifyEnabled] == "true",
+		PromoCodeEnabled:    settings[SettingKeyPromoCodeEnabled] != "false", // 默认启用
 		TurnstileEnabled:    settings[SettingKeyTurnstileEnabled] == "true",
 		TurnstileSiteKey:    settings[SettingKeyTurnstileSiteKey],
 		SiteName:            s.getStringOrDefault(settings, SettingKeySiteName, "Sub2API"),
@@ -125,6 +127,7 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 	return &struct {
 		RegistrationEnabled bool   `json:"registration_enabled"`
 		EmailVerifyEnabled  bool   `json:"email_verify_enabled"`
+		PromoCodeEnabled    bool   `json:"promo_code_enabled"`
 		TurnstileEnabled    bool   `json:"turnstile_enabled"`
 		TurnstileSiteKey    string `json:"turnstile_site_key,omitempty"`
 		SiteName            string `json:"site_name"`
@@ -140,6 +143,7 @@ func (s *SettingService) GetPublicSettingsForInjection(ctx context.Context) (any
 	}{
 		RegistrationEnabled: settings.RegistrationEnabled,
 		EmailVerifyEnabled:  settings.EmailVerifyEnabled,
+		PromoCodeEnabled:    settings.PromoCodeEnabled,
 		TurnstileEnabled:    settings.TurnstileEnabled,
 		TurnstileSiteKey:    settings.TurnstileSiteKey,
 		SiteName:            settings.SiteName,
@@ -162,6 +166,7 @@ func (s *SettingService) UpdateSettings(ctx context.Context, settings *SystemSet
 	// 注册设置
 	updates[SettingKeyRegistrationEnabled] = strconv.FormatBool(settings.RegistrationEnabled)
 	updates[SettingKeyEmailVerifyEnabled] = strconv.FormatBool(settings.EmailVerifyEnabled)
+	updates[SettingKeyPromoCodeEnabled] = strconv.FormatBool(settings.PromoCodeEnabled)
 
 	// 邮件服务设置（只有非空才更新密码）
 	updates[SettingKeySMTPHost] = settings.SMTPHost
@@ -248,6 +253,15 @@ func (s *SettingService) IsEmailVerifyEnabled(ctx context.Context) bool {
 	return value == "true"
 }
 
+// IsPromoCodeEnabled 检查是否启用优惠码功能
+func (s *SettingService) IsPromoCodeEnabled(ctx context.Context) bool {
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyPromoCodeEnabled)
+	if err != nil {
+		return true // 默认启用
+	}
+	return value != "false"
+}
+
 // GetSiteName 获取网站名称
 func (s *SettingService) GetSiteName(ctx context.Context) string {
 	value, err := s.settingRepo.GetValue(ctx, SettingKeySiteName)
@@ -297,6 +311,7 @@ func (s *SettingService) InitializeDefaultSettings(ctx context.Context) error {
 	defaults := map[string]string{
 		SettingKeyRegistrationEnabled: "true",
 		SettingKeyEmailVerifyEnabled:  "false",
+		SettingKeyPromoCodeEnabled:    "true", // 默认启用优惠码功能
 		SettingKeySiteName:            "Sub2API",
 		SettingKeySiteLogo:            "",
 		SettingKeyDefaultConcurrency:  strconv.Itoa(s.cfg.Default.UserConcurrency),
@@ -328,6 +343,7 @@ func (s *SettingService) parseSettings(settings map[string]string) *SystemSettin
 	result := &SystemSettings{
 		RegistrationEnabled:          settings[SettingKeyRegistrationEnabled] == "true",
 		EmailVerifyEnabled:           settings[SettingKeyEmailVerifyEnabled] == "true",
+		PromoCodeEnabled:             settings[SettingKeyPromoCodeEnabled] != "false", // 默认启用
 		SMTPHost:                     settings[SettingKeySMTPHost],
 		SMTPUsername:                 settings[SettingKeySMTPUsername],
 		SMTPFrom:                     settings[SettingKeySMTPFrom],

backend/internal/service/settings_view.go

@@ -3,6 +3,7 @@ package service
 type SystemSettings struct {
 	RegistrationEnabled bool
 	EmailVerifyEnabled  bool
+	PromoCodeEnabled    bool
 
 	SMTPHost               string
 	SMTPPort               int
@@ -58,6 +59,7 @@ type SystemSettings struct {
 type PublicSettings struct {
 	RegistrationEnabled bool
 	EmailVerifyEnabled  bool
+	PromoCodeEnabled    bool
 	TurnstileEnabled    bool
 	TurnstileSiteKey    string
 	SiteName            string