feat: store rdp, vnc and telnet logins in a generic per-protocol table

plugins/proxmox/src/backend/routes.ts

@@ -606,14 +606,7 @@ async function syncProxmoxHost(
         key: null,
         keyPassword: null,
         keyType: null,
-        rdpUser: null,
-        rdpPassword: null,
-        rdpDomain: null,
         rdpPort: connectionType === "rdp" ? 3389 : null,
-        vncUser: null,
-        vncPassword: null,
-        telnetUser: null,
-        telnetPassword: null,
         jumpHosts: serializeProxmoxJumpHosts(discovery.jumpHosts),
         quickActions: null,
         forceKeyboardInteractive: "false",