Add pytest test suite with CI and coverage

[GeiserX]

Summary

• Add 12 pytest tests covering media info JSON extraction, SQLite database setup and state tracking, URL filename parsing with encoding, and publication URL generation logic
• Add GitHub Actions workflow (.github/workflows/tests.yml) running pytest with codecov upload
• Add requirements-test.txt with pytest, pytest-cov, and requests
• Add codecov badge to README

Test plan

• Verify all 12 tests pass in CI
• Confirm codecov badge renders after first CI run

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: f83d5dd5-f4a8-406d-ab03-c6bb18848639

📥 Commits

Reviewing files that changed from the base of the PR and between a4073b3 and 3a50644.

📒 Files selected for processing (5)

• .github/workflows/tests.yml
• README.md
• requirements-test.txt
• tests/__init__.py
• tests/test_media_download.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/add-tests

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