apeireth-protocol v2.0.0-rc.4 — Apeireth R17 战役 1-1: LLM 协议归一化层 (OpenAI Chat / OpenAI Responses / Anthropic Messages / Gemini), 字段级对齐同类开源协议桥公开设计. R37-1 bridge facade + R20 阶段 2 WS 8 帧协议. 9 src 模块 + 51