Backend dashboard service

[chef-louis]

Description

This PR adds the following:

• READ functionality from our Supabase backend for the Dashboard.tsx and BrowseDishes.tsx pages.
• CRUD functionality for Allergies.tsx page

Fixes #52, #63, #65

Type of change

• New feature (non-breaking change which adds functionality)
• Replaces mock data with back-end connections for the relevant pages described above

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

Demo

Screencast.from.02-27-2025.11.21.07.AM.webm

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[chef-louis]

@bobbygrdn Not completely done but wanted to get a PR up with a full CRUD example so I can get any feedback before proceeding with the remaining CRUD elements. I took your PR template and added a video so hopefully those help.

[bobbygrdn]

@chef-louis This looks great so far man. Everything works as expected. Keep it up!