chore: update composer.json

See https://github.com/codeigniter4/appstarter/blob/master/composer.json

composer.json

@@ -39,6 +39,10 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "autoload": {
+        "psr-4": {
+            "App\\": "app/",
+            "Config\\": "app/Config"
+        },
         "exclude-from-classmap": [
             "**/Database/Migrations/**"
         ]
@@ -55,7 +59,10 @@
         },
         "platform": {
             "php": "8.1"
-        }
+        },
+        "optimize-autoloader": true,
+        "preferred-install": "dist",
+        "sort-packages": true
     },
     "scripts": {
         "analyze": [