add: huggingface docker

Dockerfile

@@ -1,17 +1,14 @@
-# Use Node.js 22 Alpine as base image
-FROM node:22-alpine
+# Build stage
+FROM node:22-alpine AS builder
 
 # Set working directory
 WORKDIR /app
 
-# Set NODE_ENV to production
-ENV NODE_ENV=production
-
 # Copy package files
 COPY package*.json ./
 
-# Install all dependencies (including express for production)
-RUN npm ci --omit=dev
+# Install all dependencies (including devDependencies for building)
+RUN npm ci
 
 # Copy source code
 COPY . .
@@ -19,12 +16,29 @@ COPY . .
 # Build the application
 RUN npm run build
 
-# Hugging Face Spaces handles user management automatically
+# Production stage
+FROM node:22-alpine AS production
+
+# Set NODE_ENV to production
+ENV NODE_ENV=production
+
+# Set working directory
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install only production dependencies
+RUN npm ci --omit=dev && npm cache clean --force
+
+# Copy built application from builder stage
+COPY --from=builder /app/dist ./dist
+
+# Copy server file
+COPY server.js ./
 
 # Expose port 7860 (required by Hugging Face Spaces)
 EXPOSE 7860
 
-# Health check removed for HF Spaces compatibility
-
 # Start the application
 CMD ["npm", "start"]