Fix wws runtime compatibility - use module.exports pattern

- Update api/index.js to use handler export format
- Update chat/index.js to use handler export format
- Update webhook/index.js to use handler export format
- Remove addEventListener('fetch') pattern incompatible with wws
- Remove URL API usage (not available in wws JS runtime)
- Remove spread operator for better compatibility

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

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

chat/index.js

@@ -1,36 +1,34 @@
 // Chat proxy - routes requests to n8n workflow
 // Path: /chat
 
-addEventListener('fetch', event => {
-  event.respondWith(handleRequest(event.request))
-})
-
-async function handleRequest(request) {
+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'
   }
 
   if (request.method === 'OPTIONS') {
-    return new Response(null, { headers: corsHeaders })
+    return new Response('', { headers: corsHeaders })
   }
 
   if (request.method !== 'POST') {
     return new Response(JSON.stringify({ error: 'Method not allowed' }), {
       status: 405,
-      headers: { 'Content-Type': 'application/json', ...corsHeaders }
+      headers: corsHeaders
     })
   }
 
   try {
     const body = await request.json()
-    const { message, project_id, user_id, provider = 'zai' } = body
+    const { message, project_id, user_id, provider } = body
+    const selectedProvider = provider || 'zai'
 
     if (!message) {
       return new Response(JSON.stringify({ error: 'Message is required' }), {
         status: 400,
-        headers: { 'Content-Type': 'application/json', ...corsHeaders }
+        headers: corsHeaders
       })
     }
 
@@ -39,10 +37,10 @@ async function handleRequest(request) {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({
-        message,
+        message: message,
         project_id: project_id || null,
         user_id: user_id || null,
-        provider,
+        provider: selectedProvider,
         source: 'wws-proxy',
         timestamp: new Date().toISOString()
       })
@@ -53,10 +51,10 @@ async function handleRequest(request) {
     return new Response(JSON.stringify({
       success: true,
       response: result.response || result,
-      provider,
+      provider: selectedProvider,
       timestamp: new Date().toISOString()
     }), {
-      headers: { 'Content-Type': 'application/json', ...corsHeaders }
+      headers: corsHeaders
     })
 
   } catch (error) {
@@ -65,7 +63,9 @@ async function handleRequest(request) {
       error: error.message || 'Internal server error'
     }), {
       status: 500,
-      headers: { 'Content-Type': 'application/json', ...corsHeaders }
+      headers: corsHeaders
     })
   }
 }
+
+module.exports = { handler }