chore!: change dir structure for logs

[S1M0N38]

change from

   logs/<timestamp>/
   ├── <port>.log          ← Python stdout/stderr   (base.py)
   ├── <port>.req.jsonl    ← Lua request log         (server.lua)
   ├── <port>.res.jsonl    ← Lua response log        (server.lua)
   └── <port>/             ← screenshots             (screenshot.lua)

to

 logs/2026-07-03T12-00-00/
 ├── 12346/    ← instance A
 ├── 12347/    ← instance B
 └── 12348/    ← instance C

for example

 logs/2026-07-03T12-00-00/12346/
 ├── balatro.log
 ├── requests.jsonl
 ├── responses.jsonl
 └── screenshots/
     └── 42.png