feat: add /healthz and /health endpoint for Coolify health check

Dockerfile

@@ -26,7 +26,7 @@ RUN npm run build
 # ------------------------------------------------------------------------------
 FROM nginx:1.27-alpine AS production
 
-# Inline Nginx configuration for SPA routing, gzip, and caching
+# Inline Nginx configuration for SPA routing, gzip, caching, and healthcheck
 RUN printf 'server {\n\
     listen 80;\n\
     server_name localhost;\n\
@@ -34,6 +34,11 @@ RUN printf 'server {\n\
     index index.html;\n\
     gzip on;\n\
     gzip_types text/plain text/css text/javascript application/javascript application/json image/svg+xml;\n\
+    location ~ ^/(healthz|health)$ {\n\
+        access_log off;\n\
+        default_type text/plain;\n\
+        return 200 "OK";\n\
+    }\n\
     location / {\n\
         try_files $uri $uri/ /index.html;\n\
     }\n\
@@ -49,8 +54,8 @@ COPY --from=build /app/dist /usr/share/nginx/html
 
 EXPOSE 80
 
-# Health check to ensure Nginx is responding on port 80
+# Health check endpoint for Docker & Coolify targeting /healthz
 HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
-  CMD wget --no-verbose --tries=1 --spider http://localhost:80/ || exit 1
+  CMD wget --no-verbose --tries=1 --spider http://localhost:80/healthz || exit 1
 
 CMD ["nginx", "-g", "daemon off;"]