chore!: change dir structure for logs

change from
```
logs//
├── .log ← Python stdout/stderr (base.py)
├── .req.jsonl ← Lua request log (server.lua)
├── .res.jsonl ← Lua response log (server.lua)
└── / ← 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
```