Use addEventListener fetch pattern for wws

- Switch to addEventListener('fetch') pattern
- Use response.headers.set() instead of headers object
- wws uses Fetch API event handler pattern
- Avoid URL constructor (not available in wws)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

api/index.js

@@ -1,7 +1,7 @@
 // Health check and API info endpoint
 // Path: /api
 
-async function handler(request) {
+const handler = (request) => {
   const corsHeaders = {
     'Access-Control-Allow-Origin': '*',
     'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
@@ -10,10 +10,14 @@ async function handler(request) {
   }
 
   if (request.method === 'OPTIONS') {
-    return new Response('', { headers: corsHeaders })
+    let response = new Response('')
+    response.headers.set('Access-Control-Allow-Origin', '*')
+    response.headers.set('Access-Control-Allow-Methods', 'GET, POST, OPTIONS')
+    response.headers.set('Access-Control-Allow-Headers', 'Content-Type, Authorization')
+    return response
   }
 
-  const response = {
+  const data = {
     status: 'ok',
     service: 'mylder-wws',
     version: '1.0.0',
@@ -31,10 +35,12 @@ async function handler(request) {
     ]
   }
 
-  return new Response(JSON.stringify(response, null, 2), {
-    headers: corsHeaders
-  })
+  let response = new Response(JSON.stringify(data, null, 2))
+  response.headers.set('Content-Type', 'application/json')
+  response.headers.set('Access-Control-Allow-Origin', '*')
+  return response
 }
 
-// ES Module export for wws
-export default handler
+addEventListener('fetch', event => {
+  return event.respondWith(handler(event.request))
+})