Refactor config, logging, and startup structure

Introduced pkg modules for environment config, logging, and startup initialization. Replaced direct config and logging setup in main.py with modularized functions. Updated database and migration modules to use environment variables and improved DEBUG handling. Removed tool.py and migrated password utilities to pkg. Cleaned up legacy comments and unused code in models and routes.

pkg/env.py

@@ -0,0 +1,48 @@
+"""
+环境变量管理模块
+
+负责 .env 文件的创建和环境变量的加载
+"""
+
+import os
+from dotenv import load_dotenv
+from typing import Tuple
+
+
+def ensure_env_file(env_file_path: str = '.env') -> None:
+    """
+    确保 .env 文件存在，如果不存在则创建默认配置
+    
+    :param env_file_path: .env 文件路径
+    """
+    if not os.path.exists(env_file_path):
+        default_env_content = """HOST=127.0.0.1
+PORT=8167
+
+DEBUG=false
+
+DATABASE_URL=sqlite+aiosqlite:///data.db
+"""
+        with open(env_file_path, 'w', encoding='utf-8') as f:
+            f.write(default_env_content)
+        print(f"Created default .env file at {env_file_path}")
+
+
+def load_config() -> Tuple[str, int, bool]:
+    """
+    加载配置信息
+    
+    :return: (host, port, debug) 元组
+    """
+    # 确保 .env 文件存在
+    ensure_env_file()
+    
+    # 从.env文件加载环境变量
+    load_dotenv('.env')
+    
+    # 从环境变量中加载主机、端口、调试模式等配置
+    host = os.getenv("HOST", "127.0.0.1")
+    port = int(os.getenv("PORT", 8167))
+    debug = os.getenv("DEBUG", "false").lower() in ("true", "1", "yes")
+    
+    return host, port, debug