Initial WhatToDo app

Self-hosted personal task list: FastAPI + SQLite in Docker, mobile-friendly
PWA frontend, deadlines, priorities, categories, tags, notes, checklists,
recurring tasks, single-password login, and JSON export/import.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Dockerfile

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+FROM python:3.13-slim AS base
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    DB_PATH=/data/whattodo.db
+RUN useradd --uid 1000 --create-home app
+WORKDIR /srv
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+COPY app ./app
+
+# `docker compose run --rm test`
+FROM base AS test
+COPY requirements-dev.txt .
+RUN pip install -r requirements-dev.txt
+COPY tests ./tests
+USER app
+CMD ["python", "-m", "pytest", "-q", "-p", "no:cacheprovider", "tests"]
+
+FROM base AS runtime
+COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+EXPOSE 8000
+ENTRYPOINT ["docker-entrypoint.sh"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]