Add Dockerfile, .dockerignore, and Gitea CI for image build/push

Made-with: Cursor

Dockerfile

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+# syntax=docker/dockerfile:1
+# Production image: uv sync (frozen lockfile), run FastAPI with uvicorn.
+FROM ghcr.io/astral-sh/uv:python3.12-bookworm-slim
+
+WORKDIR /app
+
+ENV UV_COMPILE_BYTECODE=1 \
+    UV_LINK_MODE=copy
+
+COPY pyproject.toml uv.lock README.md ./
+COPY src ./src
+
+RUN uv sync --frozen --no-dev
+
+ENV PATH="/app/.venv/bin:$PATH"
+
+EXPOSE 8080
+
+CMD ["uvicorn", "notebook_tools.api:app", "--host", "0.0.0.0", "--port", "8080"]