Put your .ogg files here.

Rule (auto-generated at build time):
- Any .ogg under assets/bgmfieldmod/sounds/bgm/** will be registered.
- It becomes a sound event with id: bgmfieldmod:bgm.<path>
  Example: sounds/bgm/field1.ogg -> bgmfieldmod:bgm.field1

You do NOT need to edit sounds.json manually.
