Gospel page audio: narration script, ElevenLabs generator, player on /salvation, admin Gospel Page setting; v2.40.0

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/content.ts

@@ -285,6 +285,8 @@ export interface SiteContent {
   shareQrImageUrl: string
   // ── PRISM Video ──
   prismVideoUrl: string
+  // Audio narration of the /salvation page (served to the static page via /api/salvation-audio)
+  salvationAudioUrl: string
   prismEyebrow: string
   prismHeading: string
   prismIntro: string
@@ -528,6 +530,7 @@ export const DEFAULTS: SiteContent = {
   shareP: 'Scan the QR code or text the show link to a friend who needs encouragement today.',
   shareQrImageUrl: '/images/qr-code.jpg',
   prismVideoUrl: 'https://files.versebyversewithnate.us/images/PRISM.mp4',
+  salvationAudioUrl: '',
   prismEyebrow: 'Featured Video',
   prismHeading: 'PRISM',
   prismIntro: