Add standard NPM automation

- Prettier for code formatting
- ESLint for linting
- Standard configuration files

🤖 Generated with Claude Code

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5"
+}