Migrate geo backend from Django/Graphene to Express + Apollo Server + arangojs

Replace Python stack with TypeScript. All 30+ GraphQL queries preserved including
phase-based routing (Dijkstra), H3 clustering, K_SHORTEST_PATHS, and external
routing services (GraphHopper, OpenRailRouting). Single public endpoint, no auth.

Dockerfile

@@ -1,24 +1,23 @@
-FROM python:3.12-slim
-
-ENV PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1 \
-    NIXPACKS_POETRY_VERSION=2.2.1
+FROM node:22-alpine AS builder
 
 WORKDIR /app
 
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends build-essential curl \
-    && rm -rf /var/lib/apt/lists/*
+COPY package.json ./
+RUN npm install
 
-RUN python -m venv --copies /opt/venv
-ENV VIRTUAL_ENV=/opt/venv
-ENV PATH="/opt/venv/bin:$PATH"
+COPY tsconfig.json ./
+COPY src ./src
+RUN npm run build
 
-COPY . .
+FROM node:22-alpine
 
-RUN pip install --no-cache-dir poetry==$NIXPACKS_POETRY_VERSION \
-    && poetry install --no-interaction --no-ansi
+WORKDIR /app
 
-ENV PORT=8000
+COPY package.json ./
+RUN npm install --omit=dev
 
-CMD ["sh", "-c", "poetry run python manage.py collectstatic --noinput && poetry run python -m gunicorn geo.wsgi:application --bind 0.0.0.0:${PORT:-8000}"]
+COPY --from=builder /app/dist ./dist
+
+EXPOSE 8000
+
+CMD ["node", "dist/index.js"]