- 提取 shared/auth.ts、channel-resolver.ts、route-policy.ts、provider-registry.ts - 提取 shared/openai-stream-utils.ts 和 responses-stream-utils.ts - 统一 index.ts 为 UnifiedProxyEndpoint(303→55行) - 各 provider 文件精简约55%,只保留 buildProxyRequest - 修复 claude-to-openai-proxy.ts 类型错误 - 添加 E2E mock 测试基础设施(mock-upstream + setup + run-e2e) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>