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>

resources/views/pages/auth/verify-email.blade.php

@@ -1,34 +0,0 @@
-<x-layouts::app :title="__('Verify email')">
-    <x-page brand>
-        <x-card
-            :title="__('Verify your email')"
-            :subtitle="__('Please verify your email address by clicking on the link we just emailed to you.')"
-            heading="h2"
-            variant="outlined"
-        >
-            <x-stack gap="space300">
-                @if (session('status') == 'verification-link-sent')
-                    <x-alert color="success">
-                        {{ __('A new verification link has been sent to the email address you provided during registration.') }}
-                    </x-alert>
-                @endif
-
-                <x-stack gap="space100">
-                    <x-form method="POST" action="{{ route('verification.send') }}">
-                        @csrf
-                        <x-slot:actions>
-                            <x-button type="submit" :label="__('Resend verification email')" variant="filled" />
-                        </x-slot:actions>
-                    </x-form>
-
-                    {{-- Log out posts elsewhere, so it is a form of its own; it sits under Resend at the same end
-                         edge, the card's two actions end-aligned below its content. --}}
-                    <x-row as="form" justify="end" method="POST" action="{{ route('logout') }}">
-                        @csrf
-                        <x-button type="submit" :label="__('Log out')" data-test="logout-button" />
-                    </x-row>
-                </x-stack>
-            </x-stack>
-        </x-card>
-    </x-page>
-</x-layouts::app>