Add GitHub Actions deployment workflow

- Add deployment workflow with test, build, and deploy jobs
- Add testing workflow for PRs
- Add deployment scripts (deploy, healthcheck, rollback)
- Add systemd service configuration
- Update Makefile with CI/CD targets
- Add comprehensive deployment documentation

Makefile

@@ -1,4 +1,4 @@
-.PHONY: run build test clean dev prod docker-build docker-run
+.PHONY: run build test clean dev prod docker-build docker-run ci-test ci-build health-check install-service update-service
 
 # Development
 dev:
@@ -57,15 +57,52 @@ docker-run:
 	@echo "🐳 Running Docker container..."
 	docker run -p 1999:1999 cv-server:latest
 
+# CI/CD Targets
+ci-test:
+	@echo "🧪 Running CI tests..."
+	go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
+	@echo "✓ CI tests complete"
+
+ci-build:
+	@echo "🔨 Building for CI/CD..."
+	mkdir -p build
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o build/cv-server .
+	@echo "✓ CI build complete: build/cv-server"
+
+health-check:
+	@echo "🏥 Running health check..."
+	@./scripts/healthcheck.sh
+
+install-service:
+	@echo "📦 Installing systemd service..."
+	sudo cp config/systemd/cv.service /etc/systemd/system/
+	sudo systemctl daemon-reload
+	sudo systemctl enable cv
+	@echo "✓ Service installed and enabled"
+
+update-service:
+	@echo "🔄 Updating systemd service..."
+	sudo cp config/systemd/cv.service /etc/systemd/system/
+	sudo systemctl daemon-reload
+	sudo systemctl restart cv
+	@echo "✓ Service updated and restarted"
+
 # Help
 help:
 	@echo "Available commands:"
-	@echo "  make dev          - Run in development mode (hot-reload enabled)"
-	@echo "  make prod         - Run in production mode"
-	@echo "  make build        - Build production binary"
-	@echo "  make run          - Build and run binary"
-	@echo "  make test         - Test all endpoints"
-	@echo "  make test-errors  - Test error handling"
-	@echo "  make clean        - Remove build artifacts"
-	@echo "  make docker-build - Build Docker image"
-	@echo "  make docker-run   - Run Docker container"
+	@echo "  make dev            - Run in development mode (hot-reload enabled)"
+	@echo "  make prod           - Run in production mode"
+	@echo "  make build          - Build production binary"
+	@echo "  make run            - Build and run binary"
+	@echo "  make test           - Test all endpoints"
+	@echo "  make test-errors    - Test error handling"
+	@echo "  make clean          - Remove build artifacts"
+	@echo "  make docker-build   - Build Docker image"
+	@echo "  make docker-run     - Run Docker container"
+	@echo ""
+	@echo "CI/CD commands:"
+	@echo "  make ci-test        - Run tests for CI pipeline"
+	@echo "  make ci-build       - Build binary for CI/CD"
+	@echo "  make health-check   - Check service health"
+	@echo "  make install-service - Install systemd service"
+	@echo "  make update-service - Update and restart service"