chore: Add Dockerfile.astro for root-level Astro deployment

- Builds dealplustech-astro subdirectory
- Creates data directory for SQLite database
- Exposes port 4321
- Health checks configured

Use this Dockerfile in Easypanel for Astro deployment.

Dockerfile.astro

@@ -0,0 +1,47 @@
+# Build Stage - Astro Project
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy Astro project only
+COPY dealplustech-astro/package*.json ./
+RUN npm ci
+
+COPY dealplustech-astro/ ./
+
+# Create data directory for database
+RUN mkdir -p data
+
+# Build Astro
+RUN npm run build
+
+# Production Stage
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install SQLite runtime
+RUN apk add --no-cache sqlite-libs
+
+# Copy package files
+COPY dealplustech-astro/package*.json ./
+RUN npm ci --production
+
+# Copy built assets
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/astro.config.mjs ./
+COPY --from=builder /app/data ./data
+
+EXPOSE 4321
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:4321', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+ENV NODE_ENV=production
+ENV ASTRO_DB_REMOTE_URL=file:/app/data/consent.db
+ENV PORT=4321
+
+# Start Astro preview server
+CMD ["npm", "run", "preview", "--", "--host", "0.0.0.0", "--port", "4321"]