feat: configure Jest testing infrastructure

- Update Jest config with module name mapping for uuid and node-fetch
- Add Babel transform for mixed JS/TS support
- Configure transformIgnorePatterns for ES modules
- Add comprehensive test mocks for uuid and node-fetch
- Setup import.meta environment variables for Jest compatibility
- Increase test timeout to 30 seconds for integration tests

babel.config.cjs

@@ -0,0 +1,31 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', {
+      targets: {
+        node: 'current'
+      }
+    }],
+    '@babel/preset-typescript'
+  ],
+  plugins: [
+    // Transform import.meta for Jest compatibility
+    function() {
+      return {
+        visitor: {
+          MetaProperty(path) {
+            if (path.node.meta.name === 'import' && path.node.property.name === 'meta') {
+              path.replaceWithSourceString('({ env: process.env })');
+            }
+          }
+        }
+      };
+    }
+  ],
+  env: {
+    test: {
+      plugins: [
+        // Additional test-specific plugins can go here
+      ]
+    }
+  }
+};