rewrite: Dockerfile for Python heartbeat engine — drop Node/Nginx (#548)

Dockerfile

@@ -1,35 +1,14 @@
-# Stage 1: Build the Node.js server
-FROM node:18-alpine AS builder
+FROM python:3.11-slim
 
 WORKDIR /app
 
-COPY package*.json ./
-RUN npm install
+# Install Python deps
+COPY nexus/ nexus/
+COPY server.py .
+COPY portals.json vision.json ./
 
-COPY . .
+RUN pip install --no-cache-dir websockets
 
-# Stage 2: Create the final Nginx image
-FROM nginx:alpine
+EXPOSE 8765
 
-# Copy the Node.js server from the builder stage
-COPY --from=builder /app /app
-
-# Copy the static files
-COPY . /usr/share/nginx/html
-RUN rm -f /usr/share/nginx/html/Dockerfile \
-          /usr/share/nginx/html/docker-compose.yml \
-          /usr/share/nginx/html/deploy.sh \
-          /usr/share/nginx/html/server.js \
-          /usr/share/nginx/html/package.json \
-          /usr/share/nginx/html/package-lock.json \
-          /usr/share/nginx/html/node_modules
-
-# Copy the Nginx configuration
-COPY nginx.conf /etc/nginx/nginx.conf
-
-# Expose port 80 for Nginx and 3001 for the Node.js server
-EXPOSE 80
-EXPOSE 3001
-
-# Start both Nginx and the Node.js server
-CMD ["sh", "-c", "node /app/server.js & nginx -g 'daemon off;'"]
+CMD ["python3", "server.py"]