v1.2.0: Broadcast emails, webhook admin UI, dynamic sitemap, scripture index

- Admin > Audience > Broadcast Email: compose and send one-off HTML emails
  to all subscribers via Resend batch API; {{name}} personalization; confirm step
- Admin > Configure > Webhooks: CRUD UI for managing POST event webhooks;
  backend GET/POST/DELETE /api/admin-webhooks routes wired to existing state.webhooks
- Sitemap: dynamically appends released study lesson URLs (/study/:slug/:id)
  and episode highlight URLs (/episodes/:id) to /sitemap.xml
- Scripture Index: public /scripture page listing every released lesson grouped
  by study with passage reference links; served by /api/public/scripture-index

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

server/routes/public.js

@@ -63,6 +63,23 @@ export function register(app) {
       .filter(Boolean)
       .map(item => `${root}${item}`)
 
+    // Dynamic study lesson URLs
+    const studies = Array.isArray(state.cachedSiteContent?.studies) ? state.cachedSiteContent.studies : []
+    const now = new Date()
+    for (const study of studies) {
+      if (!study.slug || !Array.isArray(study.sections)) continue
+      for (const section of study.sections) {
+        if (section.id && section.releasedAt && new Date(section.releasedAt) <= now) {
+          urls.push(`${root}/study/${encodeURIComponent(study.slug)}/${encodeURIComponent(section.id)}`)
+        }
+      }
+    }
+    // Dynamic episode highlight URLs
+    const highlights = Array.isArray(state.cachedSiteContent?.podcastFeaturedLinks) ? state.cachedSiteContent.podcastFeaturedLinks : []
+    for (const ep of highlights) {
+      if (ep.id) urls.push(`${root}/episodes/${encodeURIComponent(ep.id)}`)
+    }
+
     const xml = [
       '<?xml version="1.0" encoding="UTF-8"?>',
       '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">',
@@ -142,6 +159,25 @@ export function register(app) {
 </html>`)
   })
 
+  // Scripture index — all released study lessons with their passage references
+  app.get('/api/public/scripture-index', (_req, res) => {
+    const content = state.cachedSiteContent
+    const allStudies = Array.isArray(content?.studies) ? content.studies : []
+    const cutoff = new Date()
+    const studies = allStudies
+      .filter(s => s.slug && Array.isArray(s.sections))
+      .map(s => ({
+        slug: s.slug,
+        title: s.title || s.slug,
+        entries: s.sections
+          .filter(sec => sec.id && sec.reference && sec.releasedAt && new Date(sec.releasedAt) <= cutoff)
+          .map(sec => ({ sectionId: sec.id, title: sec.title || '', reference: sec.reference }))
+          .sort((a, b) => a.reference.localeCompare(b.reference, undefined, { numeric: true })),
+      }))
+      .filter(s => s.entries.length > 0)
+    res.json({ studies })
+  })
+
   // SPA static files and fallback
   app.use(express.static(DIST_DIR))