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>

chat/index.js

@@ -1,23 +1,20 @@
 // Chat proxy - routes requests to n8n workflow
 // Path: /chat
 
-async function handler(request) {
-  const corsHeaders = {
-    'Access-Control-Allow-Origin': '*',
-    'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
-    'Access-Control-Allow-Headers': 'Content-Type, Authorization',
-    'Content-Type': 'application/json'
-  }
-
+const handler = async (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
   }
 
   if (request.method !== 'POST') {
-    return new Response(JSON.stringify({ error: 'Method not allowed' }), {
-      status: 405,
-      headers: corsHeaders
-    })
+    let response = new Response(JSON.stringify({ error: 'Method not allowed' }))
+    response.headers.set('Content-Type', 'application/json')
+    response.headers.set('Access-Control-Allow-Origin', '*')
+    return response
   }
 
   try {
@@ -28,10 +25,10 @@ async function handler(request) {
     const provider = body.provider || 'zai'
 
     if (!message) {
-      return new Response(JSON.stringify({ error: 'Message is required' }), {
-        status: 400,
-        headers: corsHeaders
-      })
+      let response = new Response(JSON.stringify({ error: 'Message is required' }))
+      response.headers.set('Content-Type', 'application/json')
+      response.headers.set('Access-Control-Allow-Origin', '*')
+      return response
     }
 
     // Forward to n8n webhook
@@ -50,25 +47,27 @@ async function handler(request) {
 
     const result = await n8nResponse.json()
 
-    return new Response(JSON.stringify({
+    let response = new Response(JSON.stringify({
       success: true,
       response: result.response || result,
       provider: provider,
       timestamp: new Date().toISOString()
-    }), {
-      headers: corsHeaders
-    })
+    }))
+    response.headers.set('Content-Type', 'application/json')
+    response.headers.set('Access-Control-Allow-Origin', '*')
+    return response
 
   } catch (error) {
-    return new Response(JSON.stringify({
+    let response = new Response(JSON.stringify({
       success: false,
       error: error.message || 'Internal server error'
-    }), {
-      status: 500,
-      headers: corsHeaders
-    })
+    }))
+    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))
+})