fix(ai-gateway): 清理基线 ruff 违规——移除未用变量/导入、import 移至顶部、修正无效 noqa 指令

Author: Aparencia

server/ai-gateway/chains/error_pattern_chain.py

@@ -56,8 +56,6 @@ async def run(
                 "latency_ms": 123,
             }
         """
-        opts = options or {}
-
         # 构建输入文本
         errors_text = "\n".join([
             f"【错误 #{i+1}】\n正确答案：{e['correctAnswer']}\n用户回答：{e['userAnswer']}\n---"

server/ai-gateway/middleware/auth.py

@@ -14,6 +14,7 @@
 
 import base64
 import logging
+import os
 import time
 import warnings
 from typing import Optional
@@ -49,8 +50,7 @@ def _jwt_verification_configured() -> bool:
 
 # 启动时检查密钥配置
 # Phase1 安全加固：生产环境缺少密钥材料时拒绝启动（而非降级放行）
-import os as _os
-_ALLOW_DEV_AUTH = _os.getenv("GATEWAY_ALLOW_DEV_AUTH", "false").lower() == "true"
+_ALLOW_DEV_AUTH = os.getenv("GATEWAY_ALLOW_DEV_AUTH", "false").lower() == "true"
 
 if not _jwt_verification_configured():
     if APP_CONFIG.get("app_env") == "production" and not _ALLOW_DEV_AUTH:

server/ai-gateway/observability/metrics.py

@@ -9,7 +9,6 @@
 """
 
 import logging
-import time
 from collections import defaultdict
 
 logger = logging.getLogger(__name__)

server/ai-gateway/tests/test_stream_fallback_timeout.py

@@ -70,7 +70,7 @@ def _make_failing_stream_fn(error_msg="模拟故障"):
     def fn(provider, model_name):
         async def _gen():
             raise RuntimeError(error_msg)
-            yield "unreachable"  # noqa: 使 _gen 成为异步生成器
+            yield "unreachable"  # 使 _gen 成为异步生成器（此句不可达，仅为语法需要）
         return _gen()
     return fn