fix: correct path case sensitivity in PHPStan config

Build/phpstan.neon was using incorrect lowercase .build paths,
causing "File is missing or is not readable" errors in CI.

Changes:
- .build → .Build (4 occurrences in includes section)
- .build/* → .Build/* (excludePaths section)

The actual vendor directory is .Build (uppercase B) as configured
in composer.json. Linux CI environments are case-sensitive, so
incorrect case causes file not found errors.

This fixes PHPStan analysis startup failures in CI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: CybotTM

Build/phpstan.neon

@@ -1,8 +1,8 @@
 includes:
-    - %currentWorkingDirectory%/.build/vendor/phpstan/phpstan-strict-rules/rules.neon
-    - %currentWorkingDirectory%/.build/vendor/phpstan/phpstan-deprecation-rules/rules.neon
-#    - %currentWorkingDirectory%/.build/vendor/phpstan/phpstan-phpunit/rules.neon
-    - %currentWorkingDirectory%/.build/vendor/saschaegerer/phpstan-typo3/extension.neon
+    - %currentWorkingDirectory%/.Build/vendor/phpstan/phpstan-strict-rules/rules.neon
+    - %currentWorkingDirectory%/.Build/vendor/phpstan/phpstan-deprecation-rules/rules.neon
+#    - %currentWorkingDirectory%/.Build/vendor/phpstan/phpstan-phpunit/rules.neon
+    - %currentWorkingDirectory%/.Build/vendor/saschaegerer/phpstan-typo3/extension.neon
     - %currentWorkingDirectory%/Build/phpstan-baseline.neon
 
 parameters:
@@ -17,7 +17,7 @@ parameters:
         - %currentWorkingDirectory%/ext_localconf.php
 
     excludePaths:
-        - %currentWorkingDirectory%/.build/*
+        - %currentWorkingDirectory%/.Build/*
         - %currentWorkingDirectory%/ext_emconf.php
 
     # Strict configuration options for maximum code quality