feat(billing): show user display name in ledger records

Co-authored-by: Cursor <cursoragent@cursor.com>

src/admin/pages/BillingPage.tsx

@@ -839,7 +839,10 @@ function LedgerTab() {
                   {result.items.map((row) => (
                     <tr key={row.id}>
                       <td className="billing-time">{formatTime(row.createdAt)}</td>
-                      <td>@{row.username}</td>
+                      <td>
+                        <span>{row.displayName || row.username}</span>
+                        <span className="muted"> @{row.username}</span>
+                      </td>
                       <td><span className={`ledger-type-tag ledger-type-${row.type}`}>{TYPE_LABEL[row.type] ?? row.type}</span></td>
                       <td className={`billing-num ${row.amountCents < 0 ? 'text-error' : 'text-income'}`}>
                         {row.amountCents >= 0 ? '+' : ''}¥{formatYuan(Math.abs(row.amountCents))}

src/types.ts

@@ -282,6 +282,7 @@ export type LedgerEntry = {
   id: number;
   userId: string;
   username: string;
+  displayName: string;
   type: 'recharge' | 'deduct' | 'refund' | 'adjust';
   amountCents: number;
   tokens: number;