feat: add clear log for occupied port at startup

[KristjanESPERANTO]

Having repeatedly seen that users are unaware of the meaning of the EADDRINUSE error message (see, for example, this forum thread), I thought we should intercept this message and provide clearer output. This may help users identify the cause of the problem more quickly themselves.

before

[2025-09-13 09:54:32.903] [LOG]   Starting MagicMirror: v2.33.0-develop 
...
[2025-09-13 09:54:33.533] [LOG]   Starting server on port 8080 ...  
[2025-09-13 09:54:33.537] [WARN]  You're using a full whitelist configuration to allow for all IPs 
[2025-09-13 09:54:33.568] [ERROR] Whoops! There was an uncaught exception... 
[2025-09-13 09:54:33.574] [ERROR] Error: listen EADDRINUSE: address already in use 0.0.0.0:8080
    at Server.setupListenHandle [as _listen2] (node:net:1940:16)
    at listenInCluster (node:net:1997:12)
    at node:net:2206:7
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {
  code: 'EADDRINUSE',
  errno: -98,
  syscall: 'listen',
  address: '0.0.0.0',
  port: 8080
} 
[2025-09-13 09:54:33.574] [ERROR] MagicMirror² will not quit, but it might be a good idea to check why this happened. Maybe no internet connection? 
[2025-09-13 09:54:33.574] [ERROR] If you think this really is an issue, please open an issue on GitHub: https://github.com/MagicMirrorOrg/MagicMirror/issues 
[2025-09-13 09:54:35.235] [INFO]  
####  System Information  ####
...

after

[2025-09-13 09:53:20.151] [LOG]   Starting MagicMirror: v2.33.0-develop 
...
[2025-09-13 09:53:20.928] [LOG]   Starting server on port 8080 ...  
[2025-09-13 09:53:20.931] [WARN]  You're using a full whitelist configuration to allow for all IPs 
[2025-09-13 09:53:20.970] [ERROR] 
────────────────────────────────────────────────────────────────
 PORT IN USE: 0.0.0.0:8080

 Another process (most likely another MagicMirror instance)
 is already using this port.

 Stop the other process (free the port) or use a different port.
──────────────────────────────────────────────────────────────── 
[2025-09-13 09:53:22.471] [INFO]  
####  System Information  ####
...