feat: 管理面板显示用户编码

backend/app/routers/users.py

@@ -95,6 +95,7 @@ def get_users(
             "email": u.email,
             "phone": u.phone,
             "role": u.role,
+            "user_code": u.user_code,
             "created_at": u.f99_92_created_at.isoformat() if u.f99_92_created_at else None,
             "collection_count": count
         })

frontend/src/pages/Admin.jsx

@@ -189,7 +189,7 @@ export default function Admin() {
             <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
               <div style={{ flex: 1 }}>
                 <div style={{ display: 'flex', alignItems: 'center', gap: '8px' }}>
-                  <div style={{ color: '#fbbf24', fontSize: '16px', fontWeight: 'bold' }}>{user.username}</div>
+                  <div style={{ color: '#fbbf24', fontSize: '16px', fontWeight: 'bold' }}>{user.username} <span style={{color:"#fbbf24",marginLeft:8}}>#{user.user_code || "-"}</span></div>
                   <div style={{ 
                     padding: '2px 8px', borderRadius: '4px', 
                     background: user.role === 'admin' ? 'rgba(16, 185, 129, 0.2)' : 'rgba(148, 163, 184, 0.2)',