Add SealShare file sharing application with encryption, branding, auth, Docker, and Octane support

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/Feature/DefaultBrandingTest.php

@@ -0,0 +1,15 @@
+<?php
+
+use App\Models\Setting;
+
+test('database seeder sets default site title', function () {
+    $this->seed();
+
+    expect(Setting::get('site_title'))->toBe('SealShare');
+});
+
+test('database seeder sets default site description', function () {
+    $this->seed();
+
+    expect(Setting::get('site_description'))->toBe('Simple, secure file sharing');
+});