Add CI/CD pipeline with Harbor registry and SSH deployment

- Replace local deployment with proper CI/CD pipeline
- Add lint job as first stage (fail-fast)
- Build and push Docker image to Harbor registry
- Deploy via SSH with image tag from commit SHA
- Add deployment verification with health check
- Update Dockerfile to Node 20 and fix npm ci
- Support IMAGE variable in docker-compose for deployments

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -1,13 +1,13 @@
 # Build stage
-FROM node:18-alpine as build
+FROM node:20-alpine as build
 
 WORKDIR /app
 
 # Copy package files
 COPY package*.json ./
 
-# Install dependencies
-RUN npm ci --only=production
+# Install dependencies (including devDependencies needed for build)
+RUN npm ci
 
 # Copy source code
 COPY . .