Feat: Add gitlab project extraction

[AvaterClasher]

Overview

This update introduces GitLab integration to complement the existing GitHub-based evaluation system. Many developers also use GitLab for hosting their projects, and this enhancement ensures their contributions are also analyzed during resume evaluation.

Key Changes

• Added gitlab.py for GitLab API v4 integration (profile and repository data).
• Implemented GitLab profile extraction from resumes.
• Integrated repository analysis and scoring to match GitHub logic.
• Added gitlab_project_selection.jinja template for LLM-based project selection.
• Updated documentation and .env.example with GITLAB_TOKEN configuration.

Acceptance Criteria

• GitLab profiles and repositories are correctly detected and evaluated.
• Caching and error handling work as expected.
• Documentation reflects new configuration and provider support.

Looking forward to feedback for any changes.