feat: simple reasoning integration

Merge branch 'main' of https://github.com/DeltaZN/god_simulator

feat: implement NPC model switching and admin API for model management

feat: UX improvements & remove openrouter

feat: use nemotron 30b model

feat: rename god -> world

Refactor action handling and update UI elements

feat: create 2 villages - with qwen control

Implement survival mechanics in the god simulator

Add Modal LLM backends and agent memory updates

Initial god simulator foundation