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 GPN DIAGNOSTICS
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[1] Routes configured in the panel (relays.json):
    port 27015 -> 51.38.60.53:27015 via proxy 'p_swiss_93fc'
    port 27016 -> 217.156.22.149:27015 via proxy 'p_swiss_93fc'
    port 27017 -> 140.238.169.67:27015 via proxy 'p_swiss_93fc'

[2] Is the relay LISTENING on those ports? (is start-relay running?)
    port 27015: listening OK (relay is running)
    port 27016: NOT LISTENING  <-- relay is NOT running (or not on this port)
    port 27017: NOT LISTENING  <-- relay is NOT running (or not on this port)

[3] Player -> relay -> proxy -> game  (send A2S to 127.0.0.1:<port>):
    port 27015: FULL CHAIN OK — reply 102 bytes, 8ms
    port 27016: FULL CHAIN OK — reply 0 bytes, 0ms
    port 27017: FULL CHAIN OK — reply 0 bytes, 0ms

[4] Proxy direct test (VPS -> proxy -> game, bypassing relay):
    'p_swiss_93fc': OK — UDP through proxy works (157ms to 51.38.60.53:27015)

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 READ:
  - [2] NOT LISTENING  -> start-relay-windows.bat isn't running.
  - [3] OK but game won't connect from outside -> FIREWALL (inbound UDP).
  - [3] NO REPLY but [4] OK -> relay not running / wrong port.
  - [4] PROXY FAILED / NO REPLY -> the proxy itself (no UDP / whitelist).
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