perf: reduce SSH connection timeout from 5s to 2s for server metrics

- Remote metrics SSH ConnectTimeout: 5s → 2s
- Remote metrics SSH command timeout: 8s → 4s
- Health check SSH timeouts remain at 3s (already reasonable)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/modules/admin-servers/admin-servers.service.ts

@@ -104,7 +104,7 @@ export class AdminServersService {
 
   async getRemoteMetrics(): Promise<ServerInfo | null> {
     const run = (cmd: string) =>
-      execAsync(`ssh -o StrictHostKeyChecking=no -o ConnectTimeout=5 -i ${SSH_KEY_PATH} ubuntu@${REMOTE_HOST} '${cmd.replace(/'/g, "'\\''")}'`, { timeout: 8000 })
+      execAsync(`ssh -o StrictHostKeyChecking=no -o ConnectTimeout=2 -i ${SSH_KEY_PATH} ubuntu@${REMOTE_HOST} '${cmd.replace(/'/g, "'\\''")}'`, { timeout: 4000 })
         .then(r => r.stdout.trim()).catch(() => '');
 
     try {