task: add send common mail task

config/__init__.py

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+from config.settings import settings

config/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, scoped_session
+from config.settings import settings
+
+SQLALCHEMY_SYNC_URL = (
+    f"postgresql+psycopg://{settings.DB_USER}:{settings.DB_PASS}"
+    f"@{settings.DB_HOST}:{settings.DB_PORT}/{settings.DB_NAME}"
+)
+
+engine = create_engine(
+    SQLALCHEMY_SYNC_URL,
+    echo=False,       # 开发可改 True
+    future=True
+)
+
+SessionLocal = scoped_session(
+    sessionmaker(bind=engine, autoflush=False, autocommit=False)
+)

config/env_loader.py

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+import os
+from dotenv import load_dotenv
+
+def load_env():
+    """
+    自动根据 ENV 加载对应的 .env 文件
+    """
+    base_file = ".env"
+    prod_file = ".env.prod"
+    test_file = ".env.test"
+
+    # 先加载基础 .env
+    if os.path.exists(base_file):
+        load_dotenv(base_file)
+
+    # 根据参数 ENV 再加载其他环境
+    env = os.getenv("ENV", "dev")
+
+    if env == "prod" and os.path.exists(prod_file):
+        load_dotenv(prod_file, override=True)
+    elif env == "test" and os.path.exists(test_file):
+        load_dotenv(test_file, override=True)

config/settings.py

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+from pydantic_settings import BaseSettings
+from pydantic import Field
+from config.env_loader import load_env
+
+# 先加载 ENV & .env
+load_env()
+
+class Settings(BaseSettings):
+    # 环境
+    ENV: str = Field("dev")
+    DEBUG: bool = Field(True)
+
+    # 日志
+    LOG_LEVEL: str = Field("LOG_LEVEL")
+    LOG_FILE_PATH: str = Field("logs")
+    LOG_TYPE: str = Field("console")
+
+    # 数据库
+    DB_HOST: str
+    DB_PORT: int
+    DB_USER: str
+    DB_PASS: str
+    DB_NAME: str
+
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+
+
+# 全局唯一配置实例
+settings = Settings()