refactor: simplify .gitignore for composer library project

- Remove test-related rules (no testing infrastructure yet)
- Remove runtime/examples related rules (managed by sub-folders)
- Add multi-IDE support (PhpStorm, VS Code, Vim)
- Add Windows OS support (Thumbs.db)
- Keep only core rules for composer library projects

Author: dacheng-gao

.gitignore

@@ -1,7 +1,14 @@
-/vendor
-/.idea/
-/.phpunit.result.cache
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Composer
+/vendor/
 composer.lock
-.phpunit.result.cache
+
+# OS
 .DS_Store
-/app/runtime/
+Thumbs.db