Add the option to use a posgresql database instead

Change the backend data storage to a PostgreSQL database for both the web app and the mcp server. This version allows you to:

  1. Store and retrieve normalised data in a PostgreSQL database.
  2. Cache API/scraped/document data in the database to avoid redundant requests.
  3. Fallback to APIs/scraping if data isn’t found in the database.
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