feat(notion): Finalize relational DB implementation and scripts

- Implement relational data structure in Notion as per the plan.
- Add scripts for initial data import (import_product.py) and distribution to related databases (distribute_product_data.py).
- Create helper scripts for reading Notion content.
- Update Notion_Dashboard.md and GEMINI.md with the latest implementation status, database IDs, and key lessons learned from the MVP phase, including API constraints and schema-first principles.

read_notion_dashboard.py

@@ -0,0 +1,41 @@
+
+import os
+import requests
+import json
+
+# Get the Notion API key from the environment variable
+api_key = os.environ.get("NOTION_API_KEY")
+
+# If the API key is not set, try to read it from the file
+if not api_key:
+    try:
+        with open("notion_token.txt", "r") as f:
+            api_key = f.read().strip()
+    except FileNotFoundError:
+        print("Error: notion_token.txt not found.")
+        print("Please set the NOTION_API_KEY environment variable or create the notion_token.txt file.")
+        exit()
+
+# The ID of the page to retrieve
+page_id = "2e288f42-8544-81d8-96f5-c231f84f719a" # Product Master
+
+# The Notion API endpoint for retrieving a page
+url = f"https://api.notion.com/v1/pages/{page_id}"
+
+# The headers for the API request
+headers = {
+    "Authorization": f"Bearer {api_key}",
+    "Content-Type": "application/json",
+    "Notion-Version": "2022-06-28",
+}
+
+# Make the API request
+response = requests.get(url, headers=headers)
+
+# Check the response status code
+if response.status_code == 200:
+    # Print the response content
+    print(json.dumps(response.json(), indent=2))
+else:
+    print(f"Error: {response.status_code}")
+    print(response.text)