fix(validation): improve private URL handling and error feedback

Reject link-local targets even when allowlisted, link private-target errors to endpoint settings, and tighten persistent-volume table widths.

tests/Feature/ValidationErrorLinkTest.php

@@ -0,0 +1,21 @@
+<?php
+
+use Illuminate\Support\Facades\Blade;
+use Illuminate\Support\Facades\View;
+use Illuminate\Support\MessageBag;
+use Illuminate\Support\ViewErrorBag;
+
+it('renders a trailing validation error URL as a link', function () {
+    $settingsUrl = route('settings.advanced').'#endpoint-section';
+    $errors = new ViewErrorBag;
+    $errors->put('default', new MessageBag([
+        'endpoint' => "Local or private IP addresses are not allowed. Configure allowed internal targets: {$settingsUrl}",
+    ]));
+    View::share('errors', $errors);
+
+    $html = Blade::render('<x-forms.input id="endpoint" />');
+
+    expect($html)
+        ->toContain('href="'.$settingsUrl.'"')
+        ->toContain('Set them here');
+});