fix(admin-web): 修复区域账户显示省市名称

- getAccountDisplayName 支持6位区域代码（如 330100）
- 330100 → 浙江01市 (330100)
- 440600 → 广东06市 (440600)
- RegionAccountsSection 使用 regionCode 解析名称，不依赖后端 regionName

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/admin-web/src/components/features/system-account-report/SystemAccountsTab.tsx

@@ -383,8 +383,8 @@ function RegionAccountsSection({ data, type }: { data: RegionAccountsSummary; ty
             <tbody>
               {data.accounts.map((account) => (
                 <tr key={account.id}>
-                  {/* [2026-01-07] 更新：合并显示区域名称和编码 */}
-                  <td>{account.regionName ? `${account.regionName} (${account.regionCode})` : account.regionCode || '-'}</td>
+                  {/* [2026-01-07] 更新：使用 getAccountDisplayName 解析区域代码为省市名称 */}
+                  <td>{account.regionCode ? getAccountDisplayName(account.regionCode) : '-'}</td>
                   <td>{formatAmount(account.usdtBalance)}</td>
                   <td>{formatAmount(account.totalReceived)}</td>
                   <td>

frontend/admin-web/src/types/system-account.types.ts

@@ -479,7 +479,25 @@ export function getAccountDisplayName(accountSequence: string): string {
   if (SYSTEM_ACCOUNT_NAMES[accountSequence]) {
     return `${SYSTEM_ACCOUNT_NAMES[accountSequence]} (${accountSequence})`;
   }
-  // 检查是否是7位数字的区域账户
+  // 检查是否是6位数字的区域代码（如 330100）
+  if (/^\d{6}$/.test(accountSequence)) {
+    const provinceCode = accountSequence.substring(0, 2);
+    const cityPart = accountSequence.substring(2, 4);
+    const provinceName = PROVINCE_CODE_NAMES[provinceCode];
+
+    if (provinceName) {
+      // 判断是省级还是市级
+      if (cityPart === '00') {
+        // 省级
+        return `${provinceName} (${accountSequence})`;
+      } else {
+        // 市级 - 显示省份简称 + 市级代码
+        const shortProvinceName = provinceName.replace(/省|市|自治区|特别行政区|壮族|回族|维吾尔/g, '');
+        return `${shortProvinceName}${cityPart}市 (${accountSequence})`;
+      }
+    }
+  }
+  // 检查是否是7位数字的区域账户序列号
   if (/^\d{7}$/.test(accountSequence)) {
     const provinceCode = accountSequence.substring(0, 2);
     const cityPart = accountSequence.substring(2, 4);