fix(ssf): 修复安全事件连接基础阻断

为已记录旧迁移版本的环境补充幂等表修复迁移，并让 Transmitter 网络连接在 IPv6 地址不可达时继续尝试 IPv4。失败连接现在通过 If-Match 安全重试，页面同步提供重试入口并清理过期错误提示。\n\n验证：Go securityevents/migrate 测试、Web Vitest 与 TypeScript 类型检查通过。

apps/web/src/App.tsx

@@ -1033,7 +1033,8 @@ export function App() {
     setCoreState('loading');
     setCoreMessage('');
     try {
-      const connection = await connectSecurityEventTransmitter(token, transmitterIssuer);
+      const version = securityEventConnection?.connection?.version;
+      const connection = await connectSecurityEventTransmitter(token, transmitterIssuer, version);
       setSecurityEventConnection(connection);
       setCoreState('ready');
       setCoreMessage('认证中心安全事件连接正在验证。');
@@ -1045,8 +1046,17 @@ export function App() {
   }
 
   async function refreshSecurityEvents() {
-    const connection = await getSecurityEventConnection(token);
-    setSecurityEventConnection(connection);
+    setCoreState('loading');
+    setCoreMessage('');
+    try {
+      const connection = await getSecurityEventConnection(token);
+      setSecurityEventConnection(connection);
+      setCoreState('ready');
+    } catch (err) {
+      setCoreState('error');
+      setCoreMessage(err instanceof Error ? err.message : '刷新安全事件连接失败');
+      throw err;
+    }
   }
 
   async function verifySecurityEvents() {