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/Models/Share.php

@@ -10,6 +10,21 @@ class Share extends Model
 {
     use HasFactory;
 
+    /**
+     * The expiration times an uploader can choose, by the id the upload form and Admin settings
+     * store: each one's label and how long a share lasts with it.
+     *
+     * @var array<string, array{label: string, interval: string}>
+     */
+    public const EXPIRATIONS = [
+        '1h' => ['label' => '1 Hour', 'interval' => '1 hour'],
+        '24h' => ['label' => '24 Hours', 'interval' => '1 day'],
+        '48h' => ['label' => '48 Hours', 'interval' => '2 days'],
+        '7d' => ['label' => '7 Days', 'interval' => '7 days'],
+        '14d' => ['label' => '14 Days', 'interval' => '14 days'],
+        '30d' => ['label' => '30 Days', 'interval' => '30 days'],
+    ];
+
     protected $fillable = [
         'token',
         'password',