ihasmail 2.0: rebuild as Stalwart-first JMAP webmail

Replace the FastAPI/HTMX prototype with a Node/Hono session proxy and a
React 19/Vite SPA. Mail (conversation view, search operators, labels,
sanitised HTML, privacy image proxy, invites, undo send, templates),
calendar (month/week/day/agenda, invites, free/busy, categories,
context menus), contacts (JSContact, groups, vCard), files, Sieve filter
builder (incl. filter-from-message with retroactive apply), vacation,
identities with default + Reply-To, PWA/mobile layout, push via SSE,
in-memory mock Stalwart for dev, Docker + CI.

Dockerfile

@@ -1,16 +1,29 @@
-FROM python:3.12-slim
-
-ENV PYTHONDONTWRITEBYTECODE=1     PYTHONUNBUFFERED=1
-
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
+# ---- build stage ----
+FROM node:22-alpine AS build
 WORKDIR /app
+COPY package.json package-lock.json* ./
+COPY server/package.json server/
+COPY web/package.json web/
+RUN npm ci --ignore-scripts
+COPY . .
+RUN npm run build
 
-COPY pyproject.toml README.md /app/
-RUN pip install --no-cache-dir -e .
-
-COPY app /app/app
-COPY .env.example /app/.env.example
-
-ENV PORT=8000
-EXPOSE 8000
-CMD ["uvicorn", "app.main:app", "--host=0.0.0.0", "--port=8000"]
+# ---- runtime stage ----
+FROM node:22-alpine AS runtime
+ENV NODE_ENV=production \
+    HOST=0.0.0.0 \
+    PORT=8080 \
+    STATIC_DIR=/app/web/dist \
+    SESSION_FILE=/data/sessions.json
+WORKDIR /app
+COPY package.json ./
+COPY server/package.json server/
+COPY --from=build /app/node_modules ./node_modules
+COPY --from=build /app/server/dist ./server/dist
+COPY --from=build /app/web/dist ./web/dist
+RUN mkdir -p /data && chown -R node:node /data /app
+USER node
+VOLUME ["/data"]
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=5s CMD wget -qO- http://127.0.0.1:8080/api/health || exit 1
+CMD ["node", "server/dist/index.js"]