Add standard NPM automation

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

🤖 Generated with Claude Code

.eslintrc.json

@@ -0,0 +1,11 @@
+{
+  "extends": ["eslint:recommended"],
+  "env": {
+    "node": true,
+    "es2021": true
+  },
+  "parserOptions": {
+    "ecmaVersion": "latest",
+    "sourceType": "module"
+  }
+}