refactor(frontend): migrate off deprecated Ant Design 6 props

The repo's type-aware deprecation sweep (eslint.deprecated.config.js) reported fourteen findings; it now reports zero. Alert message becomes title and closable+onClose becomes closable.onClose; Select optionFilterProp moves into showSearch.optionFilterProp and suffixIcon becomes suffix; Drawer width becomes size; Progress trailColor becomes railColor. Behavior is unchanged apart from a few single-mode selects gaining type-to-filter, which the old prop already implied.

frontend/src/pages/xray/balancers/BalancerFormModal.tsx

@@ -257,7 +257,7 @@ export default function BalancerFormModal({
             <Alert
               type="info"
               showIcon
-              message={t('pages.xray.balancer.balancerFallbackInfo')}
+              title={t('pages.xray.balancer.balancerFallbackInfo')}
               style={{ marginBottom: 16 }}
             />
           )}
@@ -265,7 +265,7 @@ export default function BalancerFormModal({
             <Alert
               type="error"
               showIcon
-              message={t('pages.xray.balancer.balancerFallbackCycle')}
+              title={t('pages.xray.balancer.balancerFallbackCycle')}
               style={{ marginBottom: 16 }}
             />
           )}

frontend/src/pages/xray/dns/DnsPresetsModal.tsx

@@ -86,7 +86,7 @@ export default function DnsPresetsModal({ open, onClose, onInstall }: DnsPresets
         type="warning"
         showIcon
         className="preset-warning"
-        message={t('pages.xray.dns.dnsLeakWarning')}
+        title={t('pages.xray.dns.dnsLeakWarning')}
       />
       <div className="preset-list">
         {PRESETS.map((preset) => (

frontend/src/pages/xray/dns/DnsTab.tsx

@@ -240,7 +240,7 @@ export default function DnsTab({ templateSettings, setTemplateSettings }: DnsTab
                 <Alert
                   type="warning"
                   showIcon
-                  message={t('pages.xray.dns.dnsLeakWarning')}
+                  title={t('pages.xray.dns.dnsLeakWarning')}
                   style={{ marginBottom: 12 }}
                 />
                 <SettingListItem