MyNPC detected structure translation helper

Files:
- en_us.generated.json: regenerated template for all detected structures.
- structure_ids.txt: raw structure ids detected from Minecraft and loaded mods.
- ../mynpc_custom_assets/lang/en_us.json: active editable lang file loaded by MyNPC Config Assets.

Usage:
1. Open config/mynpc_custom_assets/lang/en_us.json.
2. Change values such as "structure.examplemod.example_structure": "Example Structure".
3. Reload resources or restart the game.

When new structure mods are added, MyNPC regenerates en_us.generated.json and structure_ids.txt.
Existing config/mynpc_custom_assets/lang/en_us.json is not overwritten.
