Feature/oauth api

[boytur]

This pull request includes several changes to the backend and frontend of the project. The most important changes include schema updates, seed data improvements, and frontend component enhancements.

Schema Updates:

• Added a new canEdit field to the Poll table and model to control edit permissions (backend/prisma/migrations/20250217164731_/migration.sql, backend/prisma/schema.prisma). [1] [2]
• Updated unique constraints and indexes for WhitelistUser, Guest, VoteRestriction, and Vote models to remove unnecessary unique constraints and add composite unique constraints where needed (backend/prisma/migrations/20250217164731_/migration.sql, backend/prisma/schema.prisma). [1] [2] [3] [4]

Seed Data Improvements:

• Refactored the seed script to create multiple users, events, polls, options, whitelist users, guests, votes, and vote restrictions with randomized data to better simulate real-world scenarios (backend/prisma/seeds/seed.ts).

Frontend Component Enhancements:

• Modified the NavUser component to include a logout function and fixed the avatar fallback to display full uppercase names (frontend/src/components/NavUser.tsx). [1] [2] [3] [4]
• Updated the Navbar component to use the logout function from the useAuth hook and fixed the import paths (frontend/src/components/Navbar.tsx).
• Added onResult prop to the QrcodeScanner component to handle QR code scan results (frontend/src/components/qrcode/QrcodeScanner.tsx).

Code Cleanup:

• Fixed import paths to use consistent casing in various frontend components (frontend/src/components/Polls.tsx, frontend/src/hooks/UseAuth.tsx). [1] [2]