chore: add dev/deploy targets to Makefile, deploy.sh

Makefile

@@ -25,4 +25,20 @@ fix:
 	cargo fmt
 	cargo clippy --fix --allow-dirty --allow-staged
 
-.PHONY: check fmt fmt-check clippy test fix publish
+# Build the frontend SPA.
+build-app:
+	cd app && npm run build
+
+# Run the backend (builds frontend first if needed).
+dev: build-app
+	JWT_SECRET=dev-secret ALLOW_REGISTRATION=true cargo run -p presentation
+
+# Run backend only (skip frontend build, assumes build-app was run).
+dev-api:
+	JWT_SECRET=dev-secret ALLOW_REGISTRATION=true cargo run -p presentation
+
+# Build and push Docker image to private registry.
+deploy:
+	./deploy.sh
+
+.PHONY: check fmt fmt-check clippy test fix build-app dev dev-api deploy