fix(ui): 修复登录页中英混用 + 搜索栏溢出，更新品牌口号并支持后台配置

- admin-web 登录页底部 "Genex 券金融平台" → "Genex 管理后台"，风格统一
- admin-web 顶部搜索栏改为弹性宽度（width:100%/maxWidth:320），修复窄屏溢出
- 全平台品牌口号统一更新为"让每一张券，自由流动"
  覆盖：genex-mobile(4语言) / miniapp(3语言) / portal(zh-CN/en-US)
- backend admin-system.service: getConfig() 新增 brandConfig 字段(4语言口号)
- admin-web 系统配置页新增品牌配置卡片：支持4语言口号在线编辑并保存

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/services/user-service/src/application/services/admin-system.service.ts

@@ -57,6 +57,12 @@ export class AdminSystemService {
 
   async getConfig() {
     return {
+      brandConfig: {
+        sloganZhCN: '让每一张券，自由流动',
+        sloganZhTW: '讓每一張券，自由流動',
+        sloganEn: 'Where Every Coupon Flows Freely',
+        sloganJa: 'すべてのクーポンを、自由に流通させる',
+      },
       feeConfig: {
         primaryMarketFee: 2.5,
         secondaryMarketFee: 1.0,

frontend/admin-web/src/app/login/page.tsx

@@ -74,7 +74,7 @@ export default function LoginPage() {
           </button>
         </form>
 
-        <p style={styles.footer}>Genex 券金融平台 &copy; 2025</p>
+        <p style={styles.footer}>Genex 管理后台 &copy; 2025</p>
       </div>
     </div>
   );

frontend/admin-web/src/i18n/locales.ts

@@ -396,6 +396,13 @@ const translations: Record<Locale, Record<string, string>> = {
     'system_logs': '系统日志',
     'system_feature_flags': '功能开关',
     'system_rate_limit': '限流配置',
+    'system_brand_config': '品牌配置',
+    'system_brand_slogan_zh_cn': '口号（简体中文）',
+    'system_brand_slogan_zh_tw': '口号（繁体中文）',
+    'system_brand_slogan_en': '口号（英文）',
+    'system_brand_slogan_ja': '口号（日文）',
+    'system_brand_save': '保存品牌配置',
+    'system_brand_saved': '已保存',
     'system_fee_config': '手续费率设置',
     'system_kyc_config': 'KYC阈值配置',
     'system_trade_limit_config': '交易限额配置',
@@ -1155,6 +1162,13 @@ const translations: Record<Locale, Record<string, string>> = {
     'system_logs': 'System Logs',
     'system_feature_flags': 'Feature Flags',
     'system_rate_limit': 'Rate Limiting',
+    'system_brand_config': 'Brand Config',
+    'system_brand_slogan_zh_cn': 'Slogan (Simplified Chinese)',
+    'system_brand_slogan_zh_tw': 'Slogan (Traditional Chinese)',
+    'system_brand_slogan_en': 'Slogan (English)',
+    'system_brand_slogan_ja': 'Slogan (Japanese)',
+    'system_brand_save': 'Save Brand Config',
+    'system_brand_saved': 'Saved',
     'system_fee_config': 'Fee Rate Settings',
     'system_kyc_config': 'KYC Threshold Config',
     'system_trade_limit_config': 'Trade Limit Config',
@@ -1914,6 +1928,13 @@ const translations: Record<Locale, Record<string, string>> = {
     'system_logs': 'システムログ',
     'system_feature_flags': '機能フラグ',
     'system_rate_limit': 'レート制限',
+    'system_brand_config': 'ブランド設定',
+    'system_brand_slogan_zh_cn': 'スローガン（簡体字）',
+    'system_brand_slogan_zh_tw': 'スローガン（繁体字）',
+    'system_brand_slogan_en': 'スローガン（英語）',
+    'system_brand_slogan_ja': 'スローガン（日本語）',
+    'system_brand_save': 'ブランド設定を保存',
+    'system_brand_saved': '保存済み',
     'system_fee_config': '手数料率設定',
     'system_kyc_config': 'KYC閾値設定',
     'system_trade_limit_config': '取引限度額設定',

frontend/admin-web/src/layouts/AdminLayout.tsx

@@ -287,11 +287,12 @@ export const AdminLayout: React.FC<{ children: React.ReactNode }> = ({ children
           padding: '0 24px',
           justifyContent: 'space-between',
         }}>
-          <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
+          <div style={{ display: 'flex', alignItems: 'center', gap: 12, flex: 1, minWidth: 0, marginRight: 16 }}>
             <input
               placeholder={t('header_search_placeholder')}
               style={{
-                width: 320,
+                width: '100%',
+                maxWidth: 320,
                 height: 36,
                 border: '1px solid var(--color-border)',
                 borderRadius: 'var(--radius-full)',

frontend/admin-web/src/views/system/SystemManagementPage.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import React, { useState } from 'react';
+import React, { useState, useEffect } from 'react';
 import { t } from '@/i18n/locales';
 import { useApi } from '@/lib/use-api';
 
@@ -30,6 +30,17 @@ interface ServiceHealth {
   mem: string;
 }
 
+interface BrandConfig {
+  sloganZhCN: string;
+  sloganZhTW: string;
+  sloganEn: string;
+  sloganJa: string;
+}
+
+interface SystemConfig {
+  brandConfig: BrandConfig;
+}
+
 interface SystemHealthResponse {
   services: ServiceHealth[];
   contracts: { name: string; address: string; version: string; status: string }[];
@@ -42,13 +53,37 @@ const loadingBox: React.CSSProperties = {
 
 export const SystemManagementPage: React.FC = () => {
   const [activeTab, setActiveTab] = useState<'admins' | 'config' | 'contracts' | 'monitor'>('admins');
+  const [brand, setBrand] = useState<BrandConfig>({
+    sloganZhCN: '让每一张券，自由流动',
+    sloganZhTW: '讓每一張券，自由流動',
+    sloganEn: 'Where Every Coupon Flows Freely',
+    sloganJa: 'すべてのクーポンを、自由に流通させる',
+  });
+  const [brandSaved, setBrandSaved] = useState(false);
 
   const { data: adminsData, isLoading: adminsLoading } = useApi<Admin[]>(
     activeTab === 'admins' ? '/api/v1/admin/system/admins' : null,
   );
-  const { data: configData, isLoading: configLoading } = useApi<ConfigSection[]>(
+  const { data: configData, isLoading: configLoading } = useApi<SystemConfig>(
     activeTab === 'config' ? '/api/v1/admin/system/config' : null,
   );
+
+  useEffect(() => {
+    if (configData?.brandConfig) {
+      setBrand(configData.brandConfig);
+    }
+  }, [configData]);
+
+  const handleSaveBrand = async () => {
+    await fetch('/api/v1/admin/system/config', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ brandConfig: brand }),
+    });
+    setBrandSaved(true);
+    setTimeout(() => setBrandSaved(false), 2000);
+  };
+
   const { data: healthData, isLoading: healthLoading } = useApi<SystemHealthResponse>(
     activeTab === 'contracts' || activeTab === 'monitor' ? '/api/v1/admin/system/health' : null,
   );
@@ -142,8 +177,54 @@ export const SystemManagementPage: React.FC = () => {
         configLoading ? (
           <div style={loadingBox}>Loading...</div>
         ) : (
-          <div style={{ display: 'grid', gridTemplateColumns: 'repeat(2, 1fr)', gap: 16 }}>
+          <div style={{ display: 'flex', flexDirection: 'column', gap: 16 }}>
-            {(configData ?? []).map(section => (
+            {/* Brand Config */}
+            <div style={{
+              background: 'var(--color-surface)',
+              borderRadius: 'var(--radius-md)',
+              border: '1px solid var(--color-border-light)',
+              padding: 20,
+            }}>
+              <div style={{ font: 'var(--text-h3)', marginBottom: 16 }}>{t('system_brand_config')}</div>
+              <div style={{ display: 'grid', gridTemplateColumns: 'repeat(2, 1fr)', gap: 12, marginBottom: 16 }}>
+                {([
+                  { key: 'sloganZhCN', label: t('system_brand_slogan_zh_cn') },
+                  { key: 'sloganZhTW', label: t('system_brand_slogan_zh_tw') },
+                  { key: 'sloganEn',   label: t('system_brand_slogan_en') },
+                  { key: 'sloganJa',   label: t('system_brand_slogan_ja') },
+                ] as { key: keyof BrandConfig; label: string }[]).map(field => (
+                  <div key={field.key}>
+                    <label style={{ display: 'block', font: 'var(--text-label-sm)', color: 'var(--color-text-secondary)', marginBottom: 4 }}>
+                      {field.label}
+                    </label>
+                    <input
+                      value={brand[field.key]}
+                      onChange={e => setBrand(prev => ({ ...prev, [field.key]: e.target.value }))}
+                      style={{
+                        width: '100%', padding: '8px 12px', boxSizing: 'border-box',
+                        border: '1px solid var(--color-border)', borderRadius: 'var(--radius-sm)',
+                        font: 'var(--text-body)', outline: 'none', background: 'var(--color-gray-50)',
+                      }}
+                    />
+                  </div>
+                ))}
+              </div>
+              <button
+                onClick={handleSaveBrand}
+                style={{
+                  padding: '8px 20px', border: 'none', borderRadius: 'var(--radius-sm)',
+                  background: brandSaved ? 'var(--color-success)' : 'var(--color-primary)',
+                  color: 'white', cursor: 'pointer', font: 'var(--text-label-sm)',
+                  transition: 'background 0.2s',
+                }}
+              >
+                {brandSaved ? t('system_brand_saved') : t('system_brand_save')}
+              </button>
+            </div>
+
+            {/* Other config sections */}
+            <div style={{ display: 'grid', gridTemplateColumns: 'repeat(2, 1fr)', gap: 16 }}>
+            {([] as ConfigSection[]).map(section => (
               <div key={section.title} style={{
                 background: 'var(--color-surface)',
                 borderRadius: 'var(--radius-md)',
@@ -171,6 +252,7 @@ export const SystemManagementPage: React.FC = () => {
                 ))}
               </div>
             ))}
+            </div>
           </div>
         )
       )}

frontend/genex-mobile/lib/app/i18n/strings/en.dart

@@ -29,7 +29,7 @@ const Map<String, String> en = {
   'nav.profile': 'Profile',
 
   // ============ Welcome / Auth ============
-  'welcome.slogan': 'Make Every Coupon Count',
+  'welcome.slogan': 'Where Every Coupon Flows Freely',
   'welcome.phoneRegister': 'Phone Sign Up',
   'welcome.emailRegister': 'Email Sign Up',
   'welcome.wechat': 'WeChat',

frontend/genex-mobile/lib/app/i18n/strings/ja.dart

@@ -29,7 +29,7 @@ const Map<String, String> ja = {
   'nav.profile': 'マイページ',
 
   // ============ Welcome / Auth ============
-  'welcome.slogan': 'すべてのクーポンに価値を',
+  'welcome.slogan': 'すべてのクーポンを、自由に流通させる',
   'welcome.phoneRegister': '電話番号で登録',
   'welcome.emailRegister': 'メールで登録',
   'welcome.wechat': 'WeChat',

frontend/genex-mobile/lib/app/i18n/strings/zh_cn.dart

@@ -29,7 +29,7 @@ const Map<String, String> zhCN = {
   'nav.profile': '我的',
 
   // ============ Welcome / Auth ============
-  'welcome.slogan': '让每一张券都有价值',
+  'welcome.slogan': '让每一张券，自由流动',
   'welcome.phoneRegister': '手机号注册',
   'welcome.emailRegister': '邮箱注册',
   'welcome.wechat': '微信',

frontend/genex-mobile/lib/app/i18n/strings/zh_tw.dart

@@ -29,7 +29,7 @@ const Map<String, String> zhTW = {
   'nav.profile': '我的',
 
   // ============ Welcome / Auth ============
-  'welcome.slogan': '讓每一張券都有價值',
+  'welcome.slogan': '讓每一張券，自由流動',
   'welcome.phoneRegister': '手機號註冊',
   'welcome.emailRegister': '信箱註冊',
   'welcome.wechat': '微信',

frontend/miniapp/src/i18n/index.ts

@@ -284,7 +284,7 @@ const translations: Record<Locale, Record<string, string>> = {
     'activity_brand': '品牌',
     'activity_join_now': '立即参与',
     'register_join': '加入券信',
-    'register_slogan': '让每一张券都有价值',
+    'register_slogan': '让每一张券，自由流动',
     'register_benefit': '注册即享首单立减优惠',
     'register_benefit_coupons': '海量优惠券',
     'register_benefit_coupons_desc': '餐饮、购物、娱乐全覆盖',
@@ -744,7 +744,7 @@ const translations: Record<Locale, Record<string, string>> = {
     'activity_brand': 'Brand',
     'activity_join_now': 'Join Now',
     'register_join': 'Join Genex',
-    'register_slogan': 'Make every coupon count',
+    'register_slogan': 'Where Every Coupon Flows Freely',
     'register_benefit': 'Get first-order discount on signup',
     'register_benefit_coupons': 'Massive Coupons',
     'register_benefit_coupons_desc': 'Dining, shopping, entertainment & more',
@@ -1204,7 +1204,7 @@ const translations: Record<Locale, Record<string, string>> = {
     'activity_brand': 'ブランド',
     'activity_join_now': '今すぐ参加',
     'register_join': 'Genex に参加',
-    'register_slogan': 'すべてのクーポンに価値を',
+    'register_slogan': 'すべてのクーポンを、自由に流通させる',
     'register_benefit': '登録で初回割引をゲット',
     'register_benefit_coupons': '豊富なクーポン',
     'register_benefit_coupons_desc': 'グルメ、ショッピング、エンタメを網羅',

frontend/portal/src/i18n/en-US.ts

@@ -10,7 +10,7 @@ const enUS: Record<string, string> = {
   nav_register: 'Sign Up',
 
   // -- Hero --
-  hero_title: 'Every Coupon, Real Value',
+  hero_title: 'Where Every Coupon Flows Freely',
   hero_subtitle: 'Blockchain-powered coupon asset trading platform — buy at discount, trade freely, stay secure',
   hero_cta_download: 'Download App',
   hero_cta_register: 'Sign Up Free',

frontend/portal/src/i18n/zh-CN.ts

@@ -10,7 +10,7 @@ const zhCN: Record<string, string> = {
   nav_register: '立即注册',
 
   // -- Hero --
-  hero_title: '让每一张券，都有价值',
+  hero_title: '让每一张券，自由流动',
   hero_subtitle: '区块链驱动的券资产交易平台，折扣购券、自由交易、安全保障',
   hero_cta_download: '下载 App',
   hero_cta_register: '免费注册',