Cut over-engineering found by a repo-wide audit

- Config: auth, services, logging, queue and database only repeated the
  framework's own files and are gone; the others keep only the keys that
  differ (app version, cache serializable_classes, session cookie name,
  Markdown mail theme, the shares disk, three Octane values, Livewire's
  pagination theme and payload guards).
- Email verification is removed: User never implemented MustVerifyEmail,
  so it was never enforced, and SealShare has a single admin and no
  registration. CreateNewUser goes with it.
- FileEncryptionService::encryptFile() and generateSalt() were only used
  by tests; tests build files with encryptTestFile() in tests/Pest.php.
- The expiration options are defined once, as Share::EXPIRATIONS. "30 Days"
  now lasts 30 days instead of a calendar month, and Admin settings only
  save a default expiration that is one of the options.
- One-caller helpers are inlined, the uploader reads chunk responses with
  XHR's responseType, and starter-kit leftovers are removed.
- Docker: PHP reads the PHP_* limits from the environment itself
  (${VAR:-default} in uploads.ini); both entrypoints stop writing the ini.
  docker-compose.yml shares the app and scheduler variables through one
  anchor. The dev image installs gd for the screenshot publisher and fake
  test images.
- Development runs in Docker only: the composer dev script, concurrently,
  laravel/pail, laravel/sail, autoprefixer and the shell-quote override
  are gone.
- phpunit.xml forces the test environment with <server> entries, so tests
  run in the dev container no longer use its real database.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/Livewire/FileUploader.php

@@ -6,8 +6,10 @@ use App\Models\Setting;
 use App\Models\Share;
 use App\Services\PasswordGeneratorService;
 use App\Services\ShareService;
+use Carbon\CarbonInterval;
 use Illuminate\Support\Facades\Crypt;
 use Illuminate\Support\Str;
+use Illuminate\Validation\Rule;
 use Illuminate\Validation\ValidationException;
 use Livewire\Attributes\Layout;
 use Livewire\Attributes\Locked;
@@ -135,7 +137,7 @@ class FileUploader extends Component
         $rules = [];
 
         if (! Setting::get('allow_never_expire', false)) {
-            $rules['expiration'] = ['required', 'string', 'in:1h,24h,48h,7d,14d,30d'];
+            $rules['expiration'] = ['required', 'string', Rule::in(array_keys(Share::EXPIRATIONS))];
         }
 
         if ($this->usePassword) {
@@ -158,15 +160,9 @@ class FileUploader extends Component
 
         $share = $shareService->completeShare($pendingShare, [
             'password' => $this->usePassword ? $this->password : null,
-            'expires_at' => match ($this->expiration) {
-                '1h' => now()->addHour(),
-                '24h' => now()->addDay(),
-                '48h' => now()->addDays(2),
-                '7d' => now()->addWeek(),
-                '14d' => now()->addDays(14),
-                '30d' => now()->addMonth(),
-                default => null,
-            },
+            'expires_at' => isset(Share::EXPIRATIONS[$this->expiration])
+                ? now()->add(CarbonInterval::make(Share::EXPIRATIONS[$this->expiration]['interval']))
+                : null,
             'max_downloads' => $this->maxDownloads ?: null,
         ]);