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>

tests/Feature/Settings/ProfileUpdateTest.php

@@ -27,10 +27,9 @@ test('profile information can be updated', function () {
 
     expect($user->name)->toEqual('Test User');
     expect($user->email)->toEqual('test@example.com');
-    expect($user->email_verified_at)->toBeNull();
 });
 
-test('email verification status is unchanged when email address is unchanged', function () {
+test('the profile saves with its own unchanged email address', function () {
     $user = User::factory()->create();
 
     $this->actingAs($user);
@@ -42,7 +41,7 @@ test('email verification status is unchanged when email address is unchanged', f
 
     $response->assertHasNoErrors();
 
-    expect($user->refresh()->email_verified_at)->not->toBeNull();
+    expect($user->refresh()->name)->toEqual('Test User');
 });
 
 test('user can delete their account', function () {