feat ✨: Add new script pve-remove-nag.sh for removing Nag messages in PVE UIs

This commit introduces a new script `pve-remove-nag.sh` designed to remove nag messages from both the Proxmox VE web and mobile user interfaces. The script is refactored to improve installation process, and the UI patching logic has been temporarily commented out for further refinement.

files/pve-remove-nag.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+# source: https://github.com/community-scripts/ProxmoxVE/blob/main/tools/pve/post-pve-install.sh
+# Commit c464b95
+
+WEB_JS=/usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js
+if [ -s "$WEB_JS" ] && ! grep -q NoMoreNagging "$WEB_JS"; then
+    echo "Patching Web UI nag..."
+    sed -i \
+      -e "/data\.status/ s/!//" \
+      -e "/data\.status/ s/active/NoMoreNagging/" \
+      "$WEB_JS"
+fi
+
+MOBILE_TPL=/usr/share/pve-yew-mobile-gui/index.html.tpl
+MARKER="<!-- MANAGED BLOCK FOR MOBILE NAG -->"
+if [ -f "$MOBILE_TPL" ] && ! grep -q "$MARKER" "$MOBILE_TPL"; then
+    echo "Patching Mobile UI nag..."
+    cat <<'EOF' >> "$MOBILE_TPL"
+<!-- MANAGED BLOCK FOR MOBILE NAG -->
+<script>
+  function removeSubscriptionElements() {
+    const dialogs =
+      document.querySelectorAll('dialog.pwt-outer-dialog');
+    dialogs.forEach(dialog => {
+      const text = (dialog.textContent || '').toLowerCase();
+      if (text.includes('subscription')) dialog.remove();
+    });
+
+    const cards = document.querySelectorAll(
+      '.pwt-card.pwt-p-2.pwt-d-flex.pwt-interactive.pwt-justify-content-center'
+    );
+    cards.forEach(card => {
+      const text = (card.textContent || '').toLowerCase();
+      const hasButton = card.querySelector('button');
+      if (!hasButton && text.includes('subscription')) card.remove();
+    });
+  }
+
+  const observer = new MutationObserver(removeSubscriptionElements);
+  observer.observe(document.body, { childList: true, subtree: true });
+  removeSubscriptionElements();
+  setInterval(removeSubscriptionElements, 300);
+  setTimeout(() => observer.disconnect(), 10000);
+</script>
+EOF
+fi