feat(web): use purple badge capsule for account proxy indicator

src/web/index.css

@@ -1869,6 +1869,11 @@ body {
   color: var(--color-text-muted);
 }
 
+.badge-purple {
+  background: #ede9fe;
+  color: #6d28d9;
+}
+
 .badge-link {
   display: inline-flex;
   text-decoration: none;

src/web/pages/Accounts.tsx

@@ -1601,7 +1601,7 @@ export default function Accounts() {
                               {connectionMode === 'apikey' ? 'API Key' : 'Session'}
                             </span>
                             {(() => { try { return JSON.parse(a.extraConfig || '{}')?.proxyUrl; } catch { return null; } })() && (
-                              <span className="badge badge-outline" style={{ fontSize: 10 }}>代理</span>
+                              <span className="badge badge-purple" style={{ fontSize: 10 }}>代理</span>
                             )}
                           </div>
                         )}
@@ -1814,7 +1814,7 @@ export default function Accounts() {
                               {connectionMode === 'apikey' ? 'API Key' : 'Session'}
                             </span>
                             {(() => { try { return JSON.parse(a.extraConfig || '{}')?.proxyUrl; } catch { return null; } })() && (
-                              <span className="badge badge-outline" style={{ fontSize: 10 }}>代理</span>
+                              <span className="badge badge-purple" style={{ fontSize: 10 }}>代理</span>
                             )}
                           </div>
                         </td>