Backend: Implemented Profile Data & Calendar Journals

[ananyavarshney1]

🚀 Overview

This PR implements the backend required for the user Profile Page and the Calendar Journal interaction using Dart Frog and Supabase.

🛠 Changes Made

• _middleware.dart: Added a global Supabase provider. Configured to use the .env file architecture to securely hold the service_role key (bypassing RLS securely for the backend).
• GET /profile: Created an endpoint that accepts a userId query parameter and fetches the user's current streak and seeds from the users table.
• GET /profile/journal: Created an endpoint that accepts a userId and date. It queries the journal_entries table and returns a JSON list of all journals for that specific day, including the summary_text, initial_mood, and final_mood.

🧪 Testing Notes for the Team

To make frontend development and testing easier, authentication checks are currently bypassed on these profile routes.

🔒 Security Note

• The SUPABASE_SERVICE_ROLE_KEY has been moved to a local .env file and added to .gitignore. Whoever pulls this branch will need to create their own .env file in the backend/ folder to run the server.