fix: ignore messaging_hook in application create/update (#567)

messaging_hook was removed along with smpp (#559), but POST and PUT
/Applications still pass the request body straight into the INSERT/UPDATE.
Clients that still send messaging_hook (even as null) get a 500:
"Unknown column 'messaging_hook' in 'field list'".

Drop the field from the request body so older clients keep working.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

lib/routes/api/applications.js

@@ -150,6 +150,8 @@ router.post('/', async(req, res) => {
 
     // create webhooks if provided
     const obj = Object.assign({}, req.body);
+    /* messaging_hook was removed along with smpp (#559); ignore it from older clients */
+    delete obj.messaging_hook;
     for (const prop of ['call_hook', 'call_status_hook']) {
       if (obj[prop]) {
         obj[`${prop}_sid`] = await Webhook.make(obj[prop]);
@@ -285,6 +287,8 @@ router.put('/:sid', async(req, res) => {
 
     // create webhooks if provided
     const obj = Object.assign({}, req.body);
+    /* messaging_hook was removed along with smpp (#559); ignore it from older clients */
+    delete obj.messaging_hook;
     for (const prop of ['call_hook', 'call_status_hook']) {
       if (prop in obj && Object.keys(obj[prop]).length) {
         if ('webhook_sid' in obj[prop]) {