A start job for unit pm2-undefined.service has finished with a failure.

--- PM2 report ----------------------------------------------------------------
Date                 : Thu Sep 25 2025 13:20:35 GMT-0300 (Brasilia Standard Time)
===============================================================================
--- Daemon -------------------------------------------------
pm2d version         : 6.0.13
node version         : 18.19.1
node path            : /usr/local/bin/pm2
argv                 : /usr/bin/node,/usr/local/lib/node_modules/pm2/lib/Daemon.js
argv0                : /usr/bin/node
user                 : undefined
uid                  : 0
gid                  : 0
uptime               : 15min
===============================================================================
--- CLI ----------------------------------------------------
local pm2            : 6.0.13
node version         : 18.19.1
node path            : /usr/local/bin/pm2
argv                 : /usr/bin/node,/usr/local/bin/pm2,report
argv0                : node
user                 : undefined
uid                  : 0
gid                  : 0
===============================================================================
--- System info --------------------------------------------
arch                 : x64
platform             : linux
type                 : Linux
cpus                 : 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
cpus nb              : 8
freemem              : 16689840128
totalmem             : 33370923008
home                 : /root
===============================================================================
--- PM2 list -----------------------------------------------
┌────┬────────┬─────────────┬─────────┬─────────┬──────────┬────────┬──────┬───────────┬──────────┬──────────┬──────────┬──────────┐
│ id │ name   │ namespace   │ version │ mode    │ pid      │ uptime │ ↺    │ status    │ cpu      │ mem      │ user     │ watching │
├────┼────────┼─────────────┼─────────┼─────────┼──────────┼────────┼──────┼───────────┼──────────┼──────────┼──────────┼──────────┤
│ 1  │ api    │ default     │ 1.0.0   │ fork    │ 546      │ 6m     │ 0    │ online    │ 0.1%     │ 70.1mb   │ root     │ disabled │
└────┴────────┴─────────────┴─────────┴─────────┴──────────┴────────┴──────┴───────────┴──────────┴──────────┴──────────┴──────────┘
===============================================================================
--- Daemon logs --------------------------------------------
/root/.pm2/pm2.log last 20 lines:
PM2        | 2025-09-25T13:04:50: PM2 log: Node.js version      : 18.19.1
PM2        | 2025-09-25T13:04:50: PM2 log: Current arch         : x64
PM2        | 2025-09-25T13:04:50: PM2 log: PM2 home             : /root/.pm2
PM2        | 2025-09-25T13:04:50: PM2 log: PM2 PID file         : /root/.pm2/pm2.pid
PM2        | 2025-09-25T13:04:50: PM2 log: RPC socket file      : /root/.pm2/rpc.sock
PM2        | 2025-09-25T13:04:50: PM2 log: BUS socket file      : /root/.pm2/pub.sock
PM2        | 2025-09-25T13:04:50: PM2 log: Application log path : /root/.pm2/logs
PM2        | 2025-09-25T13:04:50: PM2 log: Worker Interval      : 30000
PM2        | 2025-09-25T13:04:50: PM2 log: Process dump file    : /root/.pm2/dump.pm2
PM2        | 2025-09-25T13:04:50: PM2 log: Concurrent actions   : 2
PM2        | 2025-09-25T13:04:50: PM2 log: SIGTERM timeout      : 1600
PM2        | 2025-09-25T13:04:50: PM2 log: Runtime Binary       : /usr/bin/node
PM2        | 2025-09-25T13:04:50: PM2 log: ===============================================================================
PM2        | 2025-09-25T13:05:06: PM2 log: App [app:0] starting in -fork mode-
PM2        | 2025-09-25T13:05:06: PM2 log: App [app:0] online
PM2        | 2025-09-25T13:11:06: PM2 log: Stopping app:app id:0
PM2        | 2025-09-25T13:11:06: PM2 log: App [app:0] exited with code [0] via signal [SIGINT]
PM2        | 2025-09-25T13:11:07: PM2 log: pid=322 msg=process killed
PM2        | 2025-09-25T13:13:54: PM2 log: App [api:1] starting in -fork mode-
PM2        | 2025-09-25T13:13:54: PM2 log: App [api:1] online

Start with the reported PM2 version, Node.js version, Linux platform, and the daemon log excerpt, focusing on the failed pm2-undefined.service start. Reproduce the service-start failure and trace the reported unit name against PM2's startup behavior; done means the cause is identified and the service starts with the expected unit name.