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
- Implemented tests for creating, retrieving, updating, and deleting mentors in `mentor_repository_test.rs`.
- Added tests for user authentication, including successful login, invalid email formats, and inactive users in `auth_login_tests.rs`.
- Created a mock test environment setup in `mock_test.rs` to facilitate database operations during tests.
- Updated module structure to include new test files for mentors and authentication.
- Ensured cleanup of the database after tests to maintain isolation and prevent side effects.
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