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/handler/admin/setting_handler.go

@@ -47,6 +47,7 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 	response.Success(c, dto.SystemSettings{
 		RegistrationEnabled:                  settings.RegistrationEnabled,
 		EmailVerifyEnabled:                   settings.EmailVerifyEnabled,
+		PromoCodeEnabled:                     settings.PromoCodeEnabled,
 		SMTPHost:                             settings.SMTPHost,
 		SMTPPort:                             settings.SMTPPort,
 		SMTPUsername:                         settings.SMTPUsername,
@@ -90,6 +91,7 @@ type UpdateSettingsRequest struct {
 	// 注册设置
 	RegistrationEnabled bool `json:"registration_enabled"`
 	EmailVerifyEnabled  bool `json:"email_verify_enabled"`
+	PromoCodeEnabled    bool `json:"promo_code_enabled"`
 
 	// 邮件服务设置
 	SMTPHost     string `json:"smtp_host"`
@@ -240,6 +242,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 	settings := &service.SystemSettings{
 		RegistrationEnabled:        req.RegistrationEnabled,
 		EmailVerifyEnabled:         req.EmailVerifyEnabled,
+		PromoCodeEnabled:           req.PromoCodeEnabled,
 		SMTPHost:                   req.SMTPHost,
 		SMTPPort:                   req.SMTPPort,
 		SMTPUsername:               req.SMTPUsername,
@@ -314,6 +317,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 	response.Success(c, dto.SystemSettings{
 		RegistrationEnabled:                  updatedSettings.RegistrationEnabled,
 		EmailVerifyEnabled:                   updatedSettings.EmailVerifyEnabled,
+		PromoCodeEnabled:                     updatedSettings.PromoCodeEnabled,
 		SMTPHost:                             updatedSettings.SMTPHost,
 		SMTPPort:                             updatedSettings.SMTPPort,
 		SMTPUsername:                         updatedSettings.SMTPUsername,

backend/internal/handler/auth_handler.go

@@ -195,6 +195,15 @@ type ValidatePromoCodeResponse struct {
 // ValidatePromoCode 验证优惠码（公开接口，注册前调用）
 // POST /api/v1/auth/validate-promo-code
 func (h *AuthHandler) ValidatePromoCode(c *gin.Context) {
+	// 检查优惠码功能是否启用
+	if h.settingSvc != nil && !h.settingSvc.IsPromoCodeEnabled(c.Request.Context()) {
+		response.Success(c, ValidatePromoCodeResponse{
+			Valid:     false,
+			ErrorCode: "PROMO_CODE_DISABLED",
+		})
+		return
+	}
+
 	var req ValidatePromoCodeRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		response.BadRequest(c, "Invalid request: "+err.Error())

backend/internal/handler/dto/settings.go

@@ -4,6 +4,7 @@ package dto
 type SystemSettings struct {
 	RegistrationEnabled bool `json:"registration_enabled"`
 	EmailVerifyEnabled  bool `json:"email_verify_enabled"`
+	PromoCodeEnabled    bool `json:"promo_code_enabled"`
 
 	SMTPHost               string `json:"smtp_host"`
 	SMTPPort               int    `json:"smtp_port"`
@@ -55,6 +56,7 @@ type SystemSettings struct {
 type PublicSettings 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"`
 	SiteName            string `json:"site_name"`