feat: add pytest, Black, Flake8, pre-commit, and Sphinx to about page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/about.html

@@ -25,6 +25,11 @@
         <li><a href="https://www.sqlalchemy.org/" target="_blank" rel="noopener"><strong>SQLAlchemy</strong></a> — ORM and database toolkit</li>
         <li><a href="https://www.sqlite.org/" target="_blank" rel="noopener"><strong>SQLite</strong></a> — embedded database</li>
         <li><a href="https://click.palletsprojects.com/" target="_blank" rel="noopener"><strong>Click</strong></a> — command-line interface</li>
+        <li><a href="https://docs.pytest.org/" target="_blank" rel="noopener"><strong>pytest</strong></a> — testing framework</li>
+        <li><a href="https://black.readthedocs.io/" target="_blank" rel="noopener"><strong>Black</strong></a> — code formatter</li>
+        <li><a href="https://flake8.pycqa.org/" target="_blank" rel="noopener"><strong>Flake8</strong></a> — linter</li>
+        <li><a href="https://pre-commit.com/" target="_blank" rel="noopener"><strong>pre-commit</strong></a> — git hook framework</li>
+        <li><a href="https://www.sphinx-doc.org/" target="_blank" rel="noopener"><strong>Sphinx</strong></a> — documentation generator</li>
         <li><a href="https://getbootstrap.com/" target="_blank" rel="noopener"><strong>Bootstrap 5</strong></a> — responsive UI</li>
         <li><a href="https://icons.getbootstrap.com/" target="_blank" rel="noopener"><strong>Bootstrap Icons</strong></a> — interface icons</li>
     </ul>