chore: add dist files and .npmignore for npm distribution

- Include dist/ in git for npm package distribution
- Add .npmignore to exclude source files from npm package
- This ensures npm install from git works without requiring build

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

.gitignore

@@ -4,10 +4,10 @@ package-lock.json
 pnpm-lock.yaml
 yarn.lock
 
-# Build output
-dist/
+# Build output (kept in git for npm distribution)
+# dist/
 
-# TypeScript cache
+# TypeScript Cache
 *.tsbuildinfo
 
 # IDE