Switch to ES module exports for wws runtime

- Replace module.exports with export default
- wws uses ES modules, not CommonJS
- Fixes 'module is not defined' error

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

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

webhook/index.js

@@ -34,15 +34,15 @@ async function handler(request) {
       let payload
       const contentType = request.headers.get('content-type') || ''
 
-      if (contentType.includes('application/json')) {
+      if (contentType.indexOf('application/json') !== -1) {
         payload = await request.json()
       } else {
         payload = await request.text()
       }
 
-      // Get source from query params (wws provides request.url as string)
+      // Get source from query params
       let source = 'default'
-      if (request.url && request.url.includes('?')) {
+      if (request.url && request.url.indexOf('?') !== -1) {
         const queryString = request.url.split('?')[1]
         if (queryString) {
           const params = queryString.split('&')
@@ -105,4 +105,5 @@ async function handler(request) {
   })
 }
 
-module.exports = { handler }
+// ES Module export for wws
+export default handler