feat:Add compliance checks and project quality gates

This merge request adds the missing compliance tooling and CI checks required for the project quality score.

Changes include:

Added type checking with mypy

Added secret scanning with detect-secrets

Added dependency auditing with pip-audit

Added test coverage reporting with pytest-cov

Added pre-commit hook configuration

Added changelog automation config with cliff.toml

Updated GitLab/GitHub CI workflows

Added focused tests for the core complaint workflow

Resolved merge conflict markers in app and translator files