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>

app/Http/Controllers/LocaleController.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+
+/**
+ * Switches the active locale from the panel's language menu, persisting the
+ * choice on the user record so it survives into their next session.
+ */
+class LocaleController extends Controller
+{
+    public function __invoke(Request $request, string $locale): RedirectResponse
+    {
+        abort_unless(array_key_exists($locale, config('locales.supported')), 404);
+
+        $request->session()->put(config('locales.session_key'), $locale);
+
+        if ($user = $request->user()) {
+            $user->forceFill(['locale' => $locale])->save();
+        }
+
+        return back();
+    }
+}