v2.8.1 — Bug Fixes & Project Structure

What's new

• Fixed: Dockerfile was hardcoding pip dependencies instead of installing from requirements.txt — now uses COPY requirements.txt + pip install -r for proper layer caching
• Fixed: CI workflow hardcoded pip install flask pytest instead of using requirements-dev.txt
• Fixed: requirements-dev.txt only contained pytest — added flask and watchdog so it reflects what tests actually need
• Added: pyproject.toml with project metadata and pytest configuration