fix(badges): send event_badge_template_id_random on badge create

The IDB stores the random string in event_badge_template_id (overwritten
by _process_generic_props). Sending this as event_badge_template_id
passed a string to an int(11) FK column — backend silently ignored it.
Using event_badge_template_id_random lets the V3 CRUD handler resolve
it to the correct integer FK.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/events/[event_id]/(badges)/badges/ae_comp__badge_create_form.svelte

@@ -118,7 +118,9 @@ async function handle_submit(event: Event) {
     try {
         const badge_data: key_val = {
             event_person_id,
-            event_badge_template_id: selected_template_id || null,
+            // selected_template_id holds the random string (IDB stores _random overwritten into _id
+            // by _process_generic_props). The backend resolves _random fields to the integer FK.
+            event_badge_template_id_random: selected_template_id || null,
             given_name,
             family_name,
             email: email || null,