feat: LLM Gateway 部署方案（ADR-0002 rev1）

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内容

• deploy/llm-gateway/：LiteLLM config（4 alias 与 models.yaml 对齐）+ compose（image pin）+ .env.example + 三步部署 README
• validate.py：新增 gateway↔models.yaml 别名集合一致性强制
• ADR-0002 rev1：部署位置=本仓；上游 openJiuwen-ai/jiuwenswarm 官方镜像不 fork；弃 submodule（理由见 ADR）
• models.yaml：gateway 段指向更新

待用户操作（部署时）

.env 填 provider key + master key；config.yaml 四个 TODO 占位换真实模型名；docker compose up -d

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📥 Commits

Reviewing files that changed from the base of the PR and between c712670 and ac4896a.

📒 Files selected for processing (8)

• .github/workflows/validate.yml
• decisions/ADR-0002-llm-gateway.md
• deploy/llm-gateway/.env.example
• deploy/llm-gateway/README.md
• deploy/llm-gateway/config.yaml
• deploy/llm-gateway/docker-compose.yml
• registry/models.yaml
• scripts/validate.py

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