Update Dockerfile

Dockerfile

@@ -1,18 +1,27 @@
-# Hugging Face Spaces (Docker) compatible
+# Hugging Face Spaces (Docker)
 FROM node:20-alpine
 
 WORKDIR /app
 
-# Install prod deps (better build cache)
+# Copy manifests first for caching
 COPY package*.json ./
-RUN npm ci --omit=dev
+
+# If a lockfile exists, use npm ci; otherwise fall back to npm install
+# npm@10 uses --omit=dev (modern replacement for --only=production)
+RUN if [ -f package-lock.json ]; then \
+      npm ci --omit=dev ; \
+    else \
+      npm install --omit=dev ; \
+    fi
 
 # App files
 COPY public ./public
 COPY server.js ./server.js
 
-# Spaces provides PORT (usually 7860)
+# Spaces provides PORT (typically 7860)
+ENV HOST=0.0.0.0
 ENV PORT=7860
+ENV NODE_ENV=production
 EXPOSE 7860
 
 CMD ["node", "server.js"]