feat: 增加邀请码注册功能

frontend/src/api/admin/settings.ts

@@ -14,6 +14,7 @@ export interface SystemSettings {
   email_verify_enabled: boolean
   promo_code_enabled: boolean
   password_reset_enabled: boolean
+  invitation_code_enabled: boolean
   totp_enabled: boolean // TOTP 双因素认证
   totp_encryption_key_configured: boolean // TOTP 加密密钥是否已配置
   // Default settings
@@ -72,6 +73,7 @@ export interface UpdateSettingsRequest {
   email_verify_enabled?: boolean
   promo_code_enabled?: boolean
   password_reset_enabled?: boolean
+  invitation_code_enabled?: boolean
   totp_enabled?: boolean // TOTP 双因素认证
   default_balance?: number
   default_concurrency?: number

frontend/src/api/auth.ts

@@ -164,6 +164,24 @@ export async function validatePromoCode(code: string): Promise<ValidatePromoCode
   return data
 }
 
+/**
+ * Validate invitation code response
+ */
+export interface ValidateInvitationCodeResponse {
+  valid: boolean
+  error_code?: string
+}
+
+/**
+ * Validate invitation code (public endpoint, no auth required)
+ * @param code - Invitation code to validate
+ * @returns Validation result
+ */
+export async function validateInvitationCode(code: string): Promise<ValidateInvitationCodeResponse> {
+  const { data } = await apiClient.post<ValidateInvitationCodeResponse>('/auth/validate-invitation-code', { code })
+  return data
+}
+
 /**
  * Forgot password request
  */
@@ -229,6 +247,7 @@ export const authAPI = {
   getPublicSettings,
   sendVerifyCode,
   validatePromoCode,
+  validateInvitationCode,
   forgotPassword,
   resetPassword
 }