fix(ci): 修复 GitHub Actions CI 全部失败问题（Ruff Lint/Format + 测试隔离）

- Ruff 格式化：server.py、logging/__init__.py 自动格式修复
- Ruff Lint：formatters.py UP017（timezone.utc → datetime.UTC）、
  test_logging_dual_write.py I001/F401/E741×2（import 排序、未使用导入、歧义变量名）
- 测试隔离：TestDualWriteIntegration 集成测试调用 dictConfig() 后未重置日志状态，
  导致 coding.proxy 的 propagate=False 污染后续 caplog 测试，18 个测试全量运行时失败；
  新增 _reset_logging_state() 在 finally 块中彻底恢复 propagate/handlers/level

🤖 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>

Author: ThreeFish-AI

src/coding/proxy/config/server.py

@@ -26,6 +26,7 @@ class LoggingConfig(BaseModel):
         max_bytes: 单个日志文件最大字节数（触发轮转）。默认 5 MB。
         backup_count: 保留的已压缩备份文件数。默认 5。
     """
+
     level: str = "INFO"
     file: str | None = None
     max_bytes: int = 5 * 1024 * 1024

src/coding/proxy/logging/__init__.py

@@ -98,7 +98,7 @@ def build_log_config(
             },
             "access": {
                 "()": "uvicorn.logging.AccessFormatter",
-                'fmt': '%(asctime)s %(levelprefix)s %(client_addr)s - "%(request_line)s" %(status_code)s',
+                "fmt": '%(asctime)s %(levelprefix)s %(client_addr)s - "%(request_line)s" %(status_code)s',
                 "datefmt": "%Y-%m-%d %H:%M:%S",
             },
         },
@@ -157,7 +157,12 @@ def build_log_config(
 
         # 为每个 logger 添加 file handler
         # 注意：uvicorn.error 无 handlers 键（通过 propagate 继承 uvicorn 的 handler）
-        for logger_name in ("uvicorn", "uvicorn.error", "uvicorn.access", "coding.proxy"):
+        for logger_name in (
+            "uvicorn",
+            "uvicorn.error",
+            "uvicorn.access",
+            "coding.proxy",
+        ):
             logger_cfg = config["loggers"][logger_name]
             handlers = logger_cfg.get("handlers", [])
             if isinstance(handlers, list):

src/coding/proxy/logging/formatters.py

@@ -8,7 +8,7 @@
 
 import json
 import logging
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 
 
 class JsonFormatter(logging.Formatter):
@@ -37,9 +37,7 @@ def format(self, record: logging.LogRecord) -> str:
             exception = self.formatException(record.exc_info)
 
         log_entry: dict[str, object] = {
-            "timestamp": datetime.fromtimestamp(
-                record.created, tz=timezone.utc
-            ).isoformat(),
+            "timestamp": datetime.fromtimestamp(record.created, tz=UTC).isoformat(),
             "level": record.levelname,
             "logger": record.name,
             "message": message,

tests/test_logging_dual_write.py

@@ -16,16 +16,13 @@
 import logging
 import logging.config
 
-import pytest
-
+from coding.proxy.config.server import LoggingConfig
 from coding.proxy.logging import (
     JsonFormatter,
     _gzip_namer,
     _gzip_rotator,
     build_log_config,
 )
-from coding.proxy.config.server import LoggingConfig
-
 
 # ── JsonFormatter 测试 ──────────────────────────────────────────
 
@@ -279,37 +276,64 @@ def test_file_can_be_disabled(self):
 
 
 class TestDualWriteIntegration:
+    @staticmethod
+    def _reset_logging_state() -> None:
+        """彻底重置 logging 模块全局状态，消除 dictConfig 的副作用.
+
+        ``logging.config.dictConfig()`` 会修改管理器内部状态：
+        - 移除已有 handler 并注入新的（StreamHandler + RotatingFileHandler）
+        - 将 logger 级别设为 DEBUG
+        - **将 propagate 设为 False**（这是导致后续 caplog 测试失败的关键原因）
+
+        若不重置，``coding.proxy`` 及其子 logger 的消息无法传播到 root logger，
+        而 pytest 的 caplog fixture 恰好通过 root logger 捕获记录。
+        """
+        manager = logging.root.manager
+        for name, lg in list(manager.loggerDict.items()):
+            if isinstance(lg, logging.Logger):
+                lg.handlers.clear()
+                lg.level = logging.NOTSET
+                lg.propagate = True
+        root = logging.getLogger()
+        root.setLevel(logging.WARNING)
+
     def test_debug_visible_in_file_not_console(self, tmp_path, capsys):
         """验证 DEBUG 级别消息写入文件但不显示在控制台."""
         log_file = tmp_path / "integration.log"
         config = build_log_config(level="INFO", file_path=str(log_file))
 
-        logging.config.dictConfig(config)
+        try:
+            logging.config.dictConfig(config)
 
-        logger = logging.getLogger("coding.proxy.test_integration")
-        logger.debug("debug_only_message")
-        logger.info("info_message")
+            logger = logging.getLogger("coding.proxy.test_integration")
+            logger.debug("debug_only_message")
+            logger.info("info_message")
 
-        # 验证文件包含两条记录
-        log_content = log_file.read_text()
-        lines = [l for l in log_content.strip().split("\n") if l]
-        assert len(lines) == 2
+            # 验证文件包含两条记录
+            log_content = log_file.read_text()
+            lines = [line for line in log_content.strip().split("\n") if line]
+            assert len(lines) == 2
 
-        messages = [json.loads(l)["message"] for l in lines]
-        assert "debug_only_message" in messages
-        assert "info_message" in messages
+            messages = [json.loads(line)["message"] for line in lines]
+            assert "debug_only_message" in messages
+            assert "info_message" in messages
+        finally:
+            self._reset_logging_state()
 
     def test_console_only_shows_info_and_above(self, tmp_path, capsys):
         """验证控制台只输出 INFO+ 级别的消息."""
         log_file = tmp_path / "console_filter.log"
         config = build_log_config(level="INFO", file_path=str(log_file))
 
-        logging.config.dictConfig(config)
+        try:
+            logging.config.dictConfig(config)
 
-        logger = logging.getLogger("coding.proxy.test_console")
-        logger.debug("should_not_appear")
-        logger.info("should_appear")
+            logger = logging.getLogger("coding.proxy.test_console")
+            logger.debug("should_not_appear")
+            logger.info("should_appear")
 
-        captured = capsys.readouterr()
-        assert "should_not_appear" not in captured.err
-        assert "should_appear" in captured.err
+            captured = capsys.readouterr()
+            assert "should_not_appear" not in captured.err
+            assert "should_appear" in captured.err
+        finally:
+            self._reset_logging_state()