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/Actions/Fortify/CreateNewUser.php

@@ -1,33 +0,0 @@
-<?php
-
-namespace App\Actions\Fortify;
-
-use App\Concerns\PasswordValidationRules;
-use App\Concerns\ProfileValidationRules;
-use App\Models\User;
-use Illuminate\Support\Facades\Validator;
-use Laravel\Fortify\Contracts\CreatesNewUsers;
-
-class CreateNewUser implements CreatesNewUsers
-{
-    use PasswordValidationRules, ProfileValidationRules;
-
-    /**
-     * Validate and create a newly registered user.
-     *
-     * @param  array<string, string>  $input
-     */
-    public function create(array $input): User
-    {
-        Validator::make($input, [
-            ...$this->profileRules(),
-            'password' => $this->passwordRules(),
-        ])->validate();
-
-        return User::create([
-            'name' => $input['name'],
-            'email' => $input['email'],
-            'password' => $input['password'],
-        ]);
-    }
-}