feat: 分站货币符号切换功能（¥/$ 可配置，默认人民币）

后端:
- Distributor 模型新增 CurrencySymbol 字段 (default: ¥)
- /api/dist/site/info 响应中返回 currency_symbol
- PUT /api/distributor/self 支持更新 currency_symbol

分站管理后台 (web):
- DistributorSettings 新增货币符号切换 (¥ CNY / $ USD)
- 添加 i18n 翻译 (en/zh/ja/fr/ru/vi)

分站前端 (dist-site):
- Dashboard: 余额、已用额度使用动态符号
- Packages: 套餐价格、原价、订阅余额使用动态符号
- Pricing: 模型输入/输出价格使用动态符号
- Topup: 预设金额、支付金额、历史记录使用动态符号
- 7 个主题 Home 页: 套餐价格展示使用动态符号
- 所有页面通过 useSite().currency_symbol 读取，统一 fallback ¥

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

src/themes/claude/Home.jsx

@@ -16,6 +16,7 @@ export default function ClaudeHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -230,9 +231,9 @@ export default function ClaudeHome() {
                       {pkg.description && <p className="text-sm text-[#6B5D4F] mb-4">{pkg.description}</p>}
                       <div className="mt-auto pt-4">
                         <div className="flex items-baseline gap-1">
-                          <span className="text-3xl font-bold text-[#3D3024]">${pkg.price}</span>
+                          <span className="text-3xl font-bold text-[#3D3024]">{cs}{pkg.price}</span>
                           {pkg.original_price > pkg.price && (
-                            <span className="text-sm text-[#8B7D6E] line-through">${pkg.original_price}</span>
+                            <span className="text-sm text-[#8B7D6E] line-through">{cs}{pkg.original_price}</span>
                           )}
                         </div>
                         {pkg.duration > 0 && <p className="text-xs text-[#8B7D6E] mt-1">{t('home.days', { count: pkg.duration })}</p>}

src/themes/clean/Home.jsx

@@ -15,6 +15,7 @@ export default function CleanHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -207,9 +208,9 @@ export default function CleanHome() {
                       {pkg.description && <p className="text-sm text-gray-500 mb-4">{pkg.description}</p>}
                       <div className="mt-auto pt-4">
                         <div className="flex items-baseline gap-1">
-                          <span className="text-3xl font-bold text-gray-900">${pkg.price}</span>
+                          <span className="text-3xl font-bold text-gray-900">{cs}{pkg.price}</span>
                           {pkg.original_price > pkg.price && (
-                            <span className="text-sm text-gray-500 line-through">${pkg.original_price}</span>
+                            <span className="text-sm text-gray-500 line-through">{cs}{pkg.original_price}</span>
                           )}
                         </div>
                         {pkg.duration > 0 && <p className="text-xs text-gray-500 mt-1">{t('home.days', { count: pkg.duration })}</p>}

src/themes/corporate/Home.jsx

@@ -14,6 +14,7 @@ export default function CorporateHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -217,9 +218,9 @@ export default function CorporateHome() {
                         {pkg.description && <p className="text-sm text-slate-500 mb-6">{pkg.description}</p>}
                         <div className="mt-auto">
                           <div className="flex items-baseline gap-1.5">
-                            <span className="text-4xl font-bold text-slate-900">${pkg.price}</span>
+                            <span className="text-4xl font-bold text-slate-900">{cs}{pkg.price}</span>
                             {pkg.original_price > pkg.price && (
-                              <span className="text-sm text-slate-500 line-through">${pkg.original_price}</span>
+                              <span className="text-sm text-slate-500 line-through">{cs}{pkg.original_price}</span>
                             )}
                           </div>
                           {pkg.duration > 0 && <p className="text-sm text-slate-500 mt-1">{t('home.days', { count: pkg.duration })}</p>}

src/themes/dark/Home.jsx

@@ -12,6 +12,7 @@ export default function DarkHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -178,9 +179,9 @@ export default function DarkHome() {
                 <h3 className="text-lg font-semibold text-white mb-1">{pkg.name}</h3>
                 {pkg.description && <p className="text-sm text-neutral-400 mb-4">{pkg.description}</p>}
                 <div className="mt-auto pt-4">
-                  <span className="text-3xl font-bold text-emerald-400 font-mono">${pkg.price}</span>
+                  <span className="text-3xl font-bold text-emerald-400 font-mono">{cs}{pkg.price}</span>
                   {pkg.original_price > pkg.price && (
-                    <span className="text-sm text-neutral-600 line-through ml-2">${pkg.original_price}</span>
+                    <span className="text-sm text-neutral-600 line-through ml-2">{cs}{pkg.original_price}</span>
                   )}
                   {pkg.duration > 0 && <p className="text-xs text-neutral-600 mt-1">{t('home.days', { count: pkg.duration })}</p>}
                 </div>

src/themes/default/Home.jsx

@@ -14,6 +14,7 @@ export default function DefaultHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -181,9 +182,9 @@ export default function DefaultHome() {
                 {pkg.description && <p className="text-sm text-neutral-400 mb-4">{pkg.description}</p>}
                 <div className="mt-auto pt-4">
                   <div className="flex items-baseline gap-1">
-                    <span className="text-3xl font-bold text-white">${pkg.price}</span>
+                    <span className="text-3xl font-bold text-white">{cs}{pkg.price}</span>
                     {pkg.original_price > pkg.price && (
-                      <span className="text-sm text-neutral-500 line-through">${pkg.original_price}</span>
+                      <span className="text-sm text-neutral-500 line-through">{cs}{pkg.original_price}</span>
                     )}
                   </div>
                   {pkg.duration > 0 && <p className="text-xs text-neutral-500 mt-1">{t('home.days', { count: pkg.duration })}</p>}

src/themes/minimal/Home.jsx

@@ -11,6 +11,7 @@ export default function MinimalHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -142,9 +143,9 @@ export default function MinimalHome() {
                   <h3 className="text-base font-semibold text-white">{pkg.name}</h3>
                   {pkg.description && <p className="text-sm text-neutral-500 mt-1">{pkg.description}</p>}
                   <div className="mt-auto pt-6">
-                    <span className="text-3xl font-bold text-white">${pkg.price}</span>
+                    <span className="text-3xl font-bold text-white">{cs}{pkg.price}</span>
                     {pkg.original_price > pkg.price && (
-                      <span className="text-sm text-neutral-600 line-through ml-2">${pkg.original_price}</span>
+                      <span className="text-sm text-neutral-600 line-through ml-2">{cs}{pkg.original_price}</span>
                     )}
                     {pkg.duration > 0 && <p className="text-xs text-neutral-600 mt-1">{t('home.days', { count: pkg.duration })}</p>}
                   </div>

src/themes/starter/Home.jsx

@@ -14,6 +14,7 @@ export default function StarterHome() {
   const { t } = useTranslation();
   const { user } = useAuth();
   const { site } = useSite();
+  const cs = site?.currency_symbol || '¥';
   const [models, setModels] = useState([]);
   const [packages, setPackages] = useState([]);
 
@@ -186,9 +187,9 @@ export default function StarterHome() {
                 )}
                 <div className="mt-auto pt-4">
                   <div className="flex items-baseline gap-1">
-                    <span className="text-3xl font-bold text-white">${pkg.price}</span>
+                    <span className="text-3xl font-bold text-white">{cs}{pkg.price}</span>
                     {pkg.original_price > pkg.price && (
-                      <span className="text-sm text-neutral-500 line-through">${pkg.original_price}</span>
+                      <span className="text-sm text-neutral-500 line-through">{cs}{pkg.original_price}</span>
                     )}
                   </div>
                   {pkg.duration > 0 && (