refactor: 代码结构优化与常量化

将日志系统从 app/logger/ 移至 app/log/ 目录
将路由配置从 routers.py 重命名为 routes.py
将硬编码配置值移至 constants.py 中的默认常量
统一代码格式和导入排序
优化函数参数对齐方式

app/log/logger.py

@@ -0,0 +1,155 @@
+import logging
+import sys
+from typing import Dict, Optional
+import platform
+
+# ANSI转义序列颜色代码
+COLORS = {
+    'DEBUG': '\033[34m',  # 蓝色
+    'INFO': '\033[32m',  # 绿色
+    'WARNING': '\033[33m',  # 黄色
+    'ERROR': '\033[31m',  # 红色
+    'CRITICAL': '\033[1;31m'  # 红色加粗
+}
+
+# Windows系统启用ANSI支持
+if platform.system() == 'Windows':
+    import ctypes
+
+    kernel32 = ctypes.windll.kernel32
+    kernel32.SetConsoleMode(kernel32.GetStdHandle(-11), 7)
+
+
+class ColoredFormatter(logging.Formatter):
+    """
+    自定义的日志格式化器,添加颜色支持
+    """
+
+    def format(self, record):
+        # 获取对应级别的颜色代码
+        color = COLORS.get(record.levelname, '')
+        # 添加颜色代码和重置代码
+        record.levelname = f"{color}{record.levelname}\033[0m"
+        return super().format(record)
+
+
+# 日志格式
+FORMATTER = ColoredFormatter(
+    "%(asctime)s - %(name)s - %(levelname)s - [%(filename)s:%(lineno)d] - %(message)s"
+)
+
+# 日志级别映射
+LOG_LEVELS = {
+    "debug": logging.DEBUG,
+    "info": logging.INFO,
+    "warning": logging.WARNING,
+    "error": logging.ERROR,
+    "critical": logging.CRITICAL,
+}
+
+
+class Logger:
+    def __init__(self):
+        pass
+
+    _loggers: Dict[str, logging.Logger] = {}
+
+    @staticmethod
+    def setup_logger(
+            name: str,
+            level: str = "debug",
+    ) -> logging.Logger:
+        """
+        设置并获取logger
+        :param name: logger名称
+        :param level: 日志级别
+        :return: logger实例
+        """
+        if name in Logger._loggers:
+            return Logger._loggers[name]
+
+        logger = logging.getLogger(name)
+        logger.setLevel(LOG_LEVELS.get(level.lower(), logging.INFO))
+        logger.propagate = False
+
+        # 添加控制台输出
+        console_handler = logging.StreamHandler(sys.stdout)
+        console_handler.setFormatter(FORMATTER)
+        logger.addHandler(console_handler)
+
+        Logger._loggers[name] = logger
+        return logger
+
+    @staticmethod
+    def get_logger(name: str) -> Optional[logging.Logger]:
+        """
+        获取已存在的logger
+        :param name: logger名称
+        :return: logger实例或None
+        """
+        return Logger._loggers.get(name)
+
+
+# 预定义的loggers
+def get_openai_logger():
+    return Logger.setup_logger("openai")
+
+
+def get_gemini_logger():
+    return Logger.setup_logger("gemini")
+
+
+def get_chat_logger():
+    return Logger.setup_logger("chat")
+
+
+def get_model_logger():
+    return Logger.setup_logger("model")
+
+
+def get_security_logger():
+    return Logger.setup_logger("security")
+
+
+def get_key_manager_logger():
+    return Logger.setup_logger("key_manager")
+
+
+def get_main_logger():
+    return Logger.setup_logger("main")
+
+
+def get_embeddings_logger():
+    return Logger.setup_logger("embeddings")
+
+
+def get_request_logger():
+    return Logger.setup_logger("request")
+
+
+def get_retry_logger():
+    return Logger.setup_logger("retry")
+
+
+def get_image_create_logger():
+    return Logger.setup_logger("image_create")
+
+
+def get_exceptions_logger():
+    return Logger.setup_logger("exceptions")
+
+
+def get_application_logger():
+    return Logger.setup_logger("application")
+
+
+def get_initialization_logger():
+    return Logger.setup_logger("initialization")
+
+
+def get_middleware_logger():
+    return Logger.setup_logger("middleware")
+
+
+def get_routes_logger():
+    return Logger.setup_logger("routes")