feat: add docker deployment stack

Add container definitions for the web app, API, worker, and PostGIS database so the local stack can be built and run consistently.

Dockerfile

@@ -0,0 +1,37 @@
+FROM node:22-alpine AS build
+WORKDIR /app
+
+ARG VITE_API_BASE_URL
+ARG VITE_GOOGLE_MAPS_PLATFORM_KEY
+
+ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
+ENV VITE_GOOGLE_MAPS_PLATFORM_KEY=$VITE_GOOGLE_MAPS_PLATFORM_KEY
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build && npm run build:api
+
+FROM nginx:alpine AS web
+COPY --from=build /app/dist /usr/share/nginx/html
+
+FROM node:22-alpine AS api
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY --from=build /app/dist-server ./dist-server
+
+CMD ["node", "dist-server/server/src/index.js"]
+
+FROM node:22-alpine AS worker
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY --from=build /app/dist-server ./dist-server
+
+CMD ["node", "dist-server/server/src/worker.js"]