大改版，可以针对不同项目引擎进行初始化

.cursor/bootstrap/fragments/common.gitignore

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+# === Cursor runtime ===
+.cursor/local-env.json
+.cursor/changelog/.changelog-ack
+.cursor/changelog/.session-start
+.cursor/_init-backup/
+.cursor/_gitignore-preview
+
+# .cursor/.init-done 是需提交的完成标记，不得忽略
+!.cursor/.init-done
+
+# === OS ===
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+Desktop.ini
+$RECYCLE.BIN/
+.DS_Store
+._*
+.Spotlight-V100
+.Trashes
+*~
+.fuse_hidden*
+.directory
+.Trash-*
+
+# === IDE ===
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.idea/
+*.iml
+
+# === Python ===
+__pycache__/
+*.py[cod]
+*$py.class
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.coverage
+htmlcov/
+.venv/
+venv/
+
+# === Common build output ===
+/build/
+/dist/
+/out/
+
+# === Custom ===
+*.log
+*.tmp