v16-docs: fix README accuracy, add F3/S2 disclaimer to distillation script

fix: v5 remove empty tokenizer.json, unify think tokens, integrate tokenizer into training pipeline

feat: train SentencePiece tokenizer + update README

chore: replace author real name with GitHub username

fix: v3 comprehensive defect repair

feat: 初始化 Fusion 项目 - 六边形开源大模型