feat: Initial implementation of FitTrack Report Generator

This commit introduces the initial version of the FitTrack Report Generator, a FastAPI application for analyzing workout files.

Key features include:
- Parsing of FIT, TCX, and GPX workout files.
- Analysis of power, heart rate, speed, and elevation data.
- Generation of summary reports and charts.
- REST API for single and batch workout analysis.

The project structure has been set up with a `src` directory for core logic, an `api` directory for the FastAPI application, and a `tests` directory for unit, integration, and contract tests.

The development workflow is configured to use Docker and modern Python tooling.

Dockerfile

@@ -0,0 +1,11 @@
+FROM python:3.11-slim-buster
+
+WORKDIR /app
+
+COPY pyproject.toml poetry.lock ./ 
+
+RUN pip install poetry && poetry install --no-root --no-dev
+
+COPY . .
+
+CMD ["poetry", "run", "uvicorn", "api.main:app", "--host", "0.0.0.0", "--port", "8000"]