Initial commit: Pireon Admin — headless admin panel and public API

Laravel 13 + Filament 5 admin panel and REST API for a non-profit developer
collective, backed by the Pireon OAuth identity server. The public site is a
separate, server-rendered application consuming /api/public/v1.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

resources/views/filament/revisions/diff.blade.php

@@ -0,0 +1,44 @@
+@php
+    /** @var \App\Models\Revision $revision */
+    $render = function ($value): string {
+        if ($value === null || $value === '') {
+            return '—';
+        }
+
+        return is_scalar($value)
+            ? (string) $value
+            : json_encode($value, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+    };
+@endphp
+
+{{-- Old beside new, field by field. Reading the difference is the point:
+     "changed the Catalan title" is useful, "saved the page" is not. --}}
+<div class="space-y-4">
+    @forelse ($revision->fields() as $field)
+        @php($diff = $revision->diff($field))
+
+        <div class="space-y-2">
+            <p class="text-sm font-semibold text-gray-700 dark:text-gray-200">{{ $field }}</p>
+
+            <div class="grid gap-2 sm:grid-cols-2">
+                <div class="rounded-lg border border-danger-200 bg-danger-50/50 p-3 dark:border-danger-800/40 dark:bg-danger-500/5">
+                    <p class="mb-1 text-xs font-medium uppercase tracking-wide text-danger-700 dark:text-danger-400">
+                        {{ __('panel.revisions.before') }}
+                    </p>
+                    <pre class="overflow-x-auto whitespace-pre-wrap break-words text-xs text-gray-700 dark:text-gray-300">{{ $render($diff['old']) }}</pre>
+                </div>
+
+                <div class="rounded-lg border border-success-200 bg-success-50/50 p-3 dark:border-success-800/40 dark:bg-success-500/5">
+                    <p class="mb-1 text-xs font-medium uppercase tracking-wide text-success-700 dark:text-success-400">
+                        {{ __('panel.revisions.after') }}
+                    </p>
+                    <pre class="overflow-x-auto whitespace-pre-wrap break-words text-xs text-gray-700 dark:text-gray-300">{{ $render($diff['new']) }}</pre>
+                </div>
+            </div>
+        </div>
+    @empty
+        <p class="text-sm text-gray-500 dark:text-gray-400">
+            {{ __('panel.revisions.no_changes') }}
+        </p>
+    @endforelse
+</div>