Prepare deployment and Forgejo CI

Dockerfile

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+# syntax=docker/dockerfile:1
+
+FROM oven/bun:1 AS frontend-build
+WORKDIR /app/frontend
+
+COPY frontend/package.json frontend/bun.lock ./
+RUN bun install --frozen-lockfile --ignore-scripts
+
+COPY frontend/ ./
+RUN bun run build
+
+FROM python:3.12-slim AS runtime
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    HOST=0.0.0.0 \
+    PORT=8000
+
+WORKDIR /app
+
+RUN useradd --create-home --shell /usr/sbin/nologin robotu
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py auth.py calendar_feeds.py forgejo_client.py live_prototype.py prototype_cache.py settings.py update_events.py ./
+COPY --from=frontend-build /app/frontend/dist ./frontend/dist
+
+RUN chown -R robotu:robotu /app
+USER robotu
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+  CMD python -c "import urllib.request; urllib.request.urlopen('http://127.0.0.1:8000/health', timeout=3).read()"
+
+CMD ["python", "-m", "uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000", "--proxy-headers"]