chore: add .gitignore for node_modules, OS files, and editor artifacts#16

JiayuuWang wants to merge 1 commit intoChinaSiro:mainChinaSiro/claude-code-sourcemap:mainfrom

JiayuuWang:contribot/add-gitignoreJiayuuWang/claude-code-sourcemap:contribot/add-gitignoreCopy head branch name to clipboard