chore: update .gitignore with cache and temporary files

Add ignore patterns for:
- Cache files (storage/cache/*.cache.php)
- PHPStan cache (var/phpstan/cache/**)
- Temporary debug output directories
- Cookies and session files

This prevents committing:
✅ Generated cache files
✅ PHPStan analysis cache
✅ Temporary test outputs
✅ Sensitive session data

.gitignore

@@ -35,3 +35,21 @@ storage/analytics/*
 /.ansible/
 /.archive/
 /x_ansible/
+
+# Cache
+storage/cache/*.cache.php
+storage/cache/*.php
+!storage/cache/.gitkeep
+
+# PHPStan
+var/phpstan/cache/**
+!var/phpstan/.gitkeep
+
+# Temporary debug files
+scripts/debug/output/
+scripts/test/output/
+tests/tmp/
+
+# Cookies and session files
+cookies.txt
+cookies_new.txt