fix(tiers): 修复 Zhipu 非流式 429 无法触发 tier 降级#123
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根因：factory.py 中 ZhipuVendor 构造时未传入 failover_cfg 参数， 导致 BaseVendor._failover_config 为 None，should_trigger_failover() 永远返回 False。 当 Zhipu 在 message（非流式）路径返回临时 429 时，executor 无法判定应降级， 直接将 429 原样返回给客户端导致任务中断。 修复： - zhipu.py: __init__ 新增 failover_config 可选参数并转发至基类 - factory.py: _create_vendor_from_config 中给 ZhipuVendor 注入 failover_cfg - test_router_executor.py: 新增 TestExecuteMessageFailoverOn429 测试类（5 个用例） 测试结果：971/971 passed，零回归 🤖 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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Summary
factory.py中ZhipuVendor构造时未传入failover_cfg，导致BaseVendor._failover_config = None，should_trigger_failover()永远返回False变更文件
src/coding/proxy/vendors/zhipu.py__init__新增failover_config可选参数并转发至基类src/coding/proxy/server/factory.py_create_vendor_from_config给ZhipuVendor注入failover_cfgtests/test_router_executor.pyTestExecuteMessageFailoverOn429测试类（5 个用例）测试验证
修复后行为
🤖 Generated with Claude Code, CodeX, Gemini