Relax Node version constraints to >=16.x

- Change engines.node from '^22.x || ^20.x' to '>=16.x'
- Change engines.npm from '>=10.x' to '>=8.x'
- Update runtime checkNodeVersion to allow Node 16+
- Creates overlap with previous release (^16.x || ^14.x)

This allows users on Node 16/18 to upgrade smoothly while
recommending Node 20 or 22 LTS for best support.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

lib/server/bootevent.js

@@ -38,14 +38,19 @@ function boot (env, language) {
 
     const isLTS = process.release.lts ? true : false;
 
-    if (isLTS && (semver.satisfies(nodeVersion, '>=20.x'))) {
-      //NodeJS 20 is supported until April 2026
+    // Node 16+ is supported (overlap with previous release)
+    // Recommended: Node 20 LTS (until April 2026) or Node 22 LTS (until April 2027)
+    if (semver.satisfies(nodeVersion, '>=16.x')) {
+      if (isLTS) {
         console.debug('Node LTS version ' + nodeVersion + ' is supported');
+      } else {
+        console.debug('Node version ' + nodeVersion + ' is supported (current release)');
+      }
       next();
       return;
     }
 
-    console.log( 'ERROR: Node version ' + nodeVersion + ' is not supported. Please use a secure LTS version or upgrade your Node');
+    console.log( 'ERROR: Node version ' + nodeVersion + ' is not supported. Please use Node 16 or later.');
     process.exit(1);
 
   }

package.json

@@ -65,8 +65,8 @@
     }
   },
   "engines": {
-    "node": "^22.x || ^20.x",
-    "npm": ">=10.x"
+    "node": ">=16.x",
+    "npm": ">=8.x"
   },
   "dependencies": {
     "@babel/core": "^7.18.10",