Raise all file upload limits to 50MB across the stack

PHP (docker/php.ini via conf.d — loaded automatically, no -c flag needed):
  upload_max_filesize 2M -> 50M
  post_max_size       8M -> 55M

Nginx: client_max_body_size 25M -> 55M

Livewire (config/livewire.php published):
  temporary_file_upload rules max 12MB -> 50MB (max:51200)

Laravel validation rules (all in KB):
  profile photo:        5120 (5MB)  -> 51200 (50MB)
  posts image:          5120 (5MB)  -> 51200 (50MB)
  anuncios image:       5120 (5MB)  -> 51200 (50MB)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Http/Controllers/AnuncioController.php

@@ -27,7 +27,7 @@ class AnuncioController extends Controller
         $data = $request->validate([
             'title'      => 'required|string|max:200',
             'body'       => 'nullable|string|max:3000',
-            'image'      => 'nullable|image|max:5120',
+            'image'      => 'nullable|image|max:51200',
             'type'       => 'required|in:info,promocion,mantenimiento,aviso',
             'audience'   => 'required|array|min:1',
             'audience.*' => 'string',
@@ -63,7 +63,7 @@ class AnuncioController extends Controller
         $data = $request->validate([
             'title'      => 'required|string|max:200',
             'body'       => 'nullable|string|max:3000',
-            'image'      => 'nullable|image|max:5120',
+            'image'      => 'nullable|image|max:51200',
             'type'       => 'required|in:info,promocion,mantenimiento,aviso',
             'audience'   => 'required|array|min:1',
             'audience.*' => 'string',

app/Http/Controllers/PostController.php

@@ -29,7 +29,7 @@ class PostController extends Controller
     {
         $request->validate([
             'body'  => 'nullable|string|max:2000',
-            'image' => 'nullable|image|max:5120',
+            'image' => 'nullable|image|max:51200',
         ]);
 
         if (!$request->filled('body') && !$request->hasFile('image')) {