Fix profile create 307 redirect by adding trailing slash

POST /api/profiles was being redirected to /api/profiles/ (307),
which drops the request body. Match the FastAPI route definition.

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

src/haunt_fm/templates/status.html

@@ -705,7 +705,7 @@
             if (!name) { showToast('Profile name required', 'error'); return; }
             const body = { name };
             if (display) body.display_name = display;
-            const res = await apiCall('POST', '/api/profiles', body);
+            const res = await apiCall('POST', '/api/profiles/', body);
             if (res.ok) {
                 showToast('Profile "' + name + '" created', 'success');
                 setTimeout(() => location.reload(), 1000);