feat(copilot): 新增 GitHub Copilot 中间层后端，泛化 N-tier 链式路由#4
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- base.py: 新增 PROXY_SKIP_HEADERS 常量，should_trigger_failover 从抽象方法改为基于 FailoverConfig 的默认实现 - anthropic.py: 删除重复的 failover 逻辑和 _SKIP_HEADERS，精简至 31 行 - zhipu.py: 删除 should_trigger_failover 覆写，终端后端由基类默认返回 False - tier.py: 新增 BackendTier 数据类，封装 backend + circuit_breaker + quota_guard 为路由单元 - router.py: 重写为 for-loop 链式路由，支持任意数量的后端层级 - quota_guard.py: 新增 window_hours 属性供基线加载使用 - app.py: 提取 _build_circuit_breaker/_build_quota_guard 辅助函数，tier 化装配 - cli.py: 适配新的 tiers 列表格式 🤖 Generated with [Claude Code](https://github.com/claude), [CodeX](https://openai.com), [Gemini](https://github.com/apps/gemini-code-assist) Co-Authored-By: Aurelius Huang<threefish.ai@gmail.com>
- copilot.py: 实现 CopilotTokenManager（GitHub PAT → Copilot token 交换、缓存、主动/被动刷新）和 CopilotBackend（Anthropic 兼容端点转发） - schema.py: 新增 CopilotConfig、copilot_circuit_breaker、copilot_quota_guard 配置段；新增 model_validator 支持 anthropic/zhipu 旧字段向后兼容 - config.example.yaml: 补充 Copilot 后端配置示例 优先级链: Anthropic → GitHub Copilot → Zhipu/GLM 🤖 Generated with [Claude Code](https://github.com/claude), [CodeX](https://openai.com), [Gemini](https://github.com/apps/gemini-code-assist) Co-Authored-By: Aurelius Huang<threefish.ai@gmail.com>
- test_tier.py: BackendTier 可用性判断、成功/失败记录、终端层属性（15 个用例） - test_router_chain.py: 链式故障转移、CB/QG 跳过、流式路由、构造与关闭（15 个用例） - test_copilot.py: token 交换/缓存/过期刷新/失效、请求头注入、failover 继承（9 个用例） - test_backends.py: 基类 failover 默认实现验证（2 个用例） - test_config_loader.py: 旧字段迁移、Copilot 配置加载与默认值（4 个用例） 总计 87 个测试全部通过 🤖 Generated with [Claude Code](https://github.com/claude), [CodeX](https://openai.com), [Gemini](https://github.com/apps/gemini-code-assist) Co-Authored-By: Aurelius Huang<threefish.ai@gmail.com>
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概述
在 Claude Team Plan (Anthropic) 和 ZAI/GLM API (Zhipu) 之间，新增 GitHub Copilot Team Plan 作为中间层后端。同时将硬编码的 2-tier 路由泛化为 N-tier 链式责任链，消除代码重复，提升功能密度。
优先级链:
变更内容
1. 路由架构重构 (
e88ddbc)backends/base.py:should_trigger_failover从抽象方法改为基于FailoverConfig的默认实现；新增PROXY_SKIP_HEADERS常量backends/anthropic.py: 删除重复的 failover 逻辑和_SKIP_HEADERS，精简至 31 行backends/zhipu.py: 删除should_trigger_failover覆写，终端后端由基类默认返回Falserouting/tier.py(新增):BackendTier数据类，封装 backend + circuit_breaker + quota_guard 为路由单元routing/router.py: 重写为 for-loop 链式路由，支持任意数量后端层级server/app.py: 提取_build_circuit_breaker/_build_quota_guard辅助函数，tier 化装配2. Copilot 后端 (
aca9875)backends/copilot.py(新增):CopilotTokenManager: GitHub PAT → Copilot Token 交换、缓存、主动/被动刷新（asyncio.Lock 线程安全）CopilotBackend: Anthropic 兼容端点透传，401/403 自动标记 token 失效config/schema.py: 新增CopilotConfig、copilot_circuit_breaker、copilot_quota_guard；model_validator支持旧anthropic/zhipu字段向后兼容config.example.yaml: 补充 Copilot 配置示例3. 测试覆盖 (
29736ee)新增 45 个测试，总计 87 个测试全部通过：
test_tier.pytest_router_chain.pytest_copilot.pytest_backends.pytest_config_loader.py设计决策
FailoverConfig：Anthropic 和 Copilot 使用相同的故障转移判断规则测试验证
uv run pytest tests/ -v # 87 passed ✅🤖 Generated with Claude Code