chore: set PHPStan to level 5 with baseline

.phive/phars.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
-  <phar name="phpstan" version="1.11.1" installed="1.11.1" location="./tools/phpstan" copy="false"/>
+  <phar name="phpstan" version="1.11.8" installed="1.11.8" location="./tools/phpstan" copy="false"/>
   <phar name="phpunit" version="^10.5.20" installed="10.5.20" location="./tools/phpunit" copy="false"/>
   <phar name="phpcs" version="^3.10.1" installed="3.10.1" location="./tools/phpcs" copy="false"/>
   <phar name="phpcbf" version="^3.10.1" installed="3.10.1" location="./tools/phpcbf" copy="false"/>

phpstan-baseline.neon

+parameters:
+	ignoreErrors:
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:isActive\\(\\)\\.$#"
+			count: 1
+			path: ajax/activate.php
+
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:isActive\\(\\)\\.$#"
+			count: 1
+			path: ajax/deactivate.php
+
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:getTitle\\(\\)\\.$#"
+			count: 1
+			path: ajax/get.php
+
+		-
+			message: "#^Parameter \\#2 \\$callback of function usort expects callable\\(mixed, mixed\\)\\: int, Closure\\(mixed, mixed\\)\\: bool given\\.$#"
+			count: 1
+			path: ajax/search.php
+
+		-
+			message: "#^Call to an undefined method QUI\\\\CRUD\\\\Child\\:\\:isActive\\(\\)\\.$#"
+			count: 2
+			path: ajax/toggle.php
+
+		-
+			message: "#^Call to method getArticles\\(\\) on an unknown class QUI\\\\ERP\\\\Order\\\\OrderInterface\\.$#"
+			count: 1
+			path: src/QUI/ERP/Discount/Discount.php
+
+		-
+			message: "#^Parameter \\#2 \\$array of function implode expects array\\|null, string given\\.$#"
+			count: 1
+			path: src/QUI/ERP/Discount/Discount.php
+
+		-
+			message: "#^Parameter \\$Order of method QUI\\\\ERP\\\\Discount\\\\Discount\\:\\:canUsedInOrder\\(\\) has invalid type QUI\\\\ERP\\\\Order\\\\OrderInterface\\.$#"
+			count: 2
+			path: src/QUI/ERP/Discount/Discount.php
+
+		-
+			message: "#^Parameter \\#2 \\$string of function explode expects string, float\\|int\\<min, \\-1\\>\\|int\\<1, max\\>\\|true given\\.$#"
+			count: 1
+			path: src/QUI/ERP/Discount/PriceFactor.php

phpstan.dist.neon

@@ -2,7 +2,7 @@ includes:
     - phpstan-baseline.neon
 
 parameters:
-    level: 1
+    level: 5
     paths:
         - src
         - ajax