v0.1

能跑但是没写部署教程，主题和记忆识别也没写完

src/common/__init__.py

@@ -0,0 +1 @@
+# 这个文件可以为空，但必须存在 

src/common/database.py

@@ -0,0 +1,21 @@
+from pymongo import MongoClient
+from typing import Optional
+
+class Database:
+    _instance: Optional["Database"] = None
+    
+    def __init__(self, host: str, port: int, db_name: str):
+        self.client = MongoClient(host, port)
+        self.db = self.client[db_name]
+        
+    @classmethod
+    def initialize(cls, host: str, port: int, db_name: str) -> "Database":
+        if cls._instance is None:
+            cls._instance = cls(host, port, db_name)
+        return cls._instance
+        
+    @classmethod
+    def get_instance(cls) -> "Database":
+        if cls._instance is None:
+            raise RuntimeError("Database not initialized")
+        return cls._instance