feat(taskflow): add core task API, storage persistence, csv export, stats page, and test coverage

Dockerfile

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+FROM python:3.14-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    UV_LINK_MODE=copy \
+    UV_COMPILE_BYTECODE=1 \
+    PATH="/app/.venv/bin:${PATH}"
+
+WORKDIR /app
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends curl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh \
+    && ln -s /root/.local/bin/uv /usr/local/bin/uv
+
+COPY pyproject.toml uv.lock* ./
+
+RUN uv sync --frozen --no-dev
+
+COPY app ./app
+COPY templates ./templates
+COPY data ./data
+
+RUN mkdir -p /app/data
+
+EXPOSE 8000
+
+CMD ["uv", "run", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]