Added auth to backend

[claiireyu]

Overview

Implement user authentication with Firebase and JWT, add user model and service, and update GraphQL mutations and queries

Changes Made

• Added Firebase Admin verification for Google idTokens.
• Added JWT access and refresh token generation.
• Added user model, repository, and service using firebase_uid.
• Added loginUser and signupUser GraphQL mutations.
• Added protected me and myFavoritedGames queries.
• Added standardized UNAUTHENTICATED GraphQL errors.

Test Coverage

Graphql Local Playground

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 87b12889-fa03-4c40-b470-2969b0a42055

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