feat(ipsec): add certificate export functionality by name

- Implemented a new backend route for exporting existing client certificates in .p12 format by name.
- Enhanced the frontend to support exporting certificates directly from the IPsec server grid.
- Updated the IPsec page to manage certificate states and handle exports effectively.
- Introduced new utility functions for certificate handling and improved data structures to accommodate the changes.
- Added tests to ensure the reliability of the new certificate export feature.

shared/api/ipsec.ts

@@ -97,6 +97,19 @@ export async function exportIpsecUserCert(
   )
 }
 
+export async function exportIpsecCertByName(
+  baseUrl: string,
+  serverId: string,
+  name: string,
+  passphrase: string,
+): Promise<IpsecCertBundle> {
+  return requestJson<IpsecCertBundle>(
+    baseUrl,
+    `/api/ipsec/certs/${encodeURIComponent(serverId)}/export`,
+    { method: "POST", body: JSON.stringify({ name, passphrase }) },
+  )
+}
+
 export async function restoreIpsecRevision(
   baseUrl: string,
   revisionId: string,