Merge pull request #237 from Rikki-Zero/debug

refactor: 修复database单例多次初始化的问题，改变instance默认返回实例的类型，缩短db相关函数调用时的object名

src/plugins/chat/__init__.py

@@ -32,18 +32,6 @@ _message_manager_started = False
 driver = get_driver()
 config = driver.config
 
-Database.initialize(
-    uri=os.getenv("MONGODB_URI"),
-    host=os.getenv("MONGODB_HOST", "127.0.0.1"),
-    port=int(os.getenv("MONGODB_PORT", "27017")),
-    db_name=os.getenv("DATABASE_NAME", "MegBot"),
-    username=os.getenv("MONGODB_USERNAME"),
-    password=os.getenv("MONGODB_PASSWORD"),
-    auth_source=os.getenv("MONGODB_AUTH_SOURCE"),
-)
-logger.success("初始化数据库成功")
-
-
 # 初始化表情管理器
 emoji_manager.initialize()