refactor: update Notion client integration and database schema retrieval

- Replaced the `notion_client.Client` with `notion_automation.notion_client.NotionClient` for improved modularity.
- Updated the authentication method to use `NOTION_API_KEY` instead of `NOTION_TOKEN`.
- Modified the database retrieval method to align with the new client structure, enhancing clarity and maintainability.

notion_automation/get_database.py

@@ -1,20 +1,20 @@
 import sys
 import json
-from notion_client import Client
+from notion_automation.notion_client import NotionClient
 import os
 from dotenv import load_dotenv
 
 def get_database_schema(database_id):
     """Retrieve and format the schema of a Notion database."""
     load_dotenv()
-    notion = Client(auth=os.getenv("NOTION_TOKEN"))
+    notion = NotionClient(auth_token=os.getenv("NOTION_API_KEY"))
 
     try:
-        database = notion.databases.retrieve(database_id=database_id)
+        database = notion.get_database(database_id)
 
         # Extract and format the properties schema
         schema = {
-            "title": database["title"][0]["plain_text"] if database.get("title") else "",
+            "title": database["title"],
             "properties": {}
         }