feat: Define unique index on users table for email and fix minor syntax error
refactor: Update permissions_guard to use claims from JWT and improve user retrieval
refactor: Modify user-related service methods to accept user details directly
fix: Update token generation functions to include user ID and permissions
test: Update Google OAuth flow tests to reflect changes in token generation
- Added Google OAuth controller and service to handle authentication via Google.
- Introduced DTOs for Google user and token responses.
- Updated AuthService and UsersService traits to support new Google OAuth functionality.
- Implemented logic to create a new user if they do not exist in the system after Google authentication.
- Enhanced existing user retrieval and JWT generation upon successful login.
- Added tests for Google OAuth flow, including login redirection and callback handling for both new and existing users.
- Updated environment configuration to include Google OAuth credentials.
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