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/js/share-uploader.js

@@ -202,10 +202,11 @@ document.addEventListener('alpine:init', () => {
                 xhr.setRequestHeader('Content-Type', 'application/octet-stream')
                 xhr.setRequestHeader('Accept', 'application/json')
                 xhr.setRequestHeader('X-CSRF-TOKEN', csrfToken)
+                xhr.responseType = 'json'
                 xhr.upload.onprogress = (event) => onProgress(event.loaded)
                 xhr.onload = () => {
                     this.request = null
-                    resolve({ status: xhr.status, uploadedChunks: parseUploadedChunks(xhr.responseText) })
+                    resolve({ status: xhr.status, uploadedChunks: xhr.response?.uploaded_chunks })
                 }
                 xhr.onerror = () => {
                     this.request = null
@@ -307,11 +308,3 @@ function chunkNonce(prefix, index, isLast) {
 
     return nonce
 }
-
-function parseUploadedChunks(responseText) {
-    try {
-        return JSON.parse(responseText).uploaded_chunks
-    } catch {
-        return undefined
-    }
-}