feat(backend): initial setup for cms backend service

backend/Dockerfile

@@ -0,0 +1,67 @@
+# Multi-stage build for Gallus CMS Backend
+
+# Stage 1: Builder
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Install build dependencies for native modules (better-sqlite3)
+RUN apk add --no-cache python3 make g++
+
+# Install dependencies
+COPY package*.json ./
+RUN npm ci
+
+# Copy source
+COPY . .
+
+# Build TypeScript
+RUN npm run build
+
+# Stage 2: Production
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install runtime dependencies (git for simple-git, sqlite3 CLI tool)
+RUN apk add --no-cache git sqlite
+
+# Install build dependencies for better-sqlite3 (needed for npm ci)
+RUN apk add --no-cache python3 make g++
+
+# Copy package files
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm ci --production
+
+# Remove build dependencies after install
+RUN apk del python3 make g++
+
+# Copy built files from builder
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/src/db/migrations ./dist/db/migrations
+
+# Create directories
+RUN mkdir -p /app/workspace /app/data
+
+# Ensure proper permissions
+RUN chown -R node:node /app
+
+# Switch to non-root user
+USER node
+
+# Expose port
+EXPOSE 8080
+
+# Set environment
+ENV NODE_ENV=production
+ENV PORT=8080
+ENV DATABASE_PATH=/app/data/gallus_cms.db
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:8080/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Start application
+CMD ["node", "dist/index.js"]