fix: make js-build graceful when npm is not available

Guard the js-build target so it warns instead of failing when npm is
not installed. This prevents serve/dev targets from breaking in
environments without Node.js — the API server still starts, only the
admin UI bundle is skipped. Also adds --no-audit --no-fund to suppress
noisy npm output during server startup.

Signed-off-by: Mihai Criveti <crivetimihai@gmail.com>

Author: crivetimihai

Makefile

@@ -260,8 +260,11 @@ check-env-dev:
 
 ## --- JS build ----------------------------------------------------------------
 js-build:                        ## Install npm dependencies and build JS bundle with Vite
-	npm install
-	npm run vite:build
+	@if command -v npm >/dev/null 2>&1; then \
+		npm install --no-audit --no-fund && npm run vite:build; \
+	else \
+		echo "WARNING: npm not found — skipping JS bundle build (admin UI may not load)"; \
+	fi
 
 ## --- Primary servers ---------------------------------------------------------
 serve: js-build                  ## Run production server with Gunicorn + Uvicorn (default)