Remove Spotify iframe branch from episode detail pages; v1.1.9

Individual episode pages always use EpisodeAudioPlayer — the Spotify
iframe check is removed since all per-episode embeds use direct audio URLs.

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "1.1.8",
+  "version": "1.1.9",
   "type": "module",
   "scripts": {
     "dev": "vite",