[TASK] #593: generate phpstan-compatible code (void return types, @var array<mixed>)

[PKuhlmay]

Summary

Fixes #593 — generates phpstan-compatible code for basic TYPO3 extensions.

• : void return types on setter methods: Fixed a parsing bug in ClassFactory::buildClassMethodObject() that silently dropped void (and other primitive types) when reading method templates. PHP-Parser represents void as an Identifier node, not FullyQualified — the condition was too narrow.
• : void return types on inject methods: Same root cause — existing inject methods with : void lost their return type during round-trip parsing. Now preserved correctly.
• @var array<mixed> on $defaultOrderings: Added the missing PHPDoc annotation to Repository.phpt so generated repositories pass phpstan without warnings.
• Correct code output: Fixed NodeFactory::buildMethodNode() to emit primitive return types as Identifier nodes (output: void) instead of FullyQualified (which would incorrectly output \void).

Changes

• Classes/Parser/ClassFactory.php — handle Identifier return type nodes
• Classes/Parser/NodeFactory.php — emit primitive types as Identifier, class types as FullyQualified
• Resources/Private/CodeTemplates/Extbase/Classes/Domain/Repository/Repository.phpt — add @var array<mixed> to $defaultOrderings
• Tests/Unit/Parser/ClassFactoryTest.php — two new tests covering the parsing and output round-trip

Test plan

• buildClassMethodObjectParsesVoidReturnType — verifies : void is parsed correctly
• buildMethodNodeOutputsVoidReturnTypeWithoutLeadingBackslash — verifies output is : void not : \void
• All 155 unit tests pass
• PHPStan: no errors

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