Use the canonical product name in public surfaces

Align the README, support bundles, webhook payloads, and updater identity with Multi Hoster Uploader while preserving repository and artifact slugs for compatibility.

lib/webhook-notify.js

@@ -78,7 +78,7 @@ function buildWebhookRequest(url, summary, meta) {
       .join(' · ');
     if (hosterEntries.length > MAX_HOSTER_LINES) hosterLines += ` · …+${hosterEntries.length - MAX_HOSTER_LINES}`;
     const lines = [
-      `**Multi-Hoster-Upload — ${headline}**${m.machineName ? ` (${m.machineName})` : ''}`,
+      `**Multi Hoster Uploader — ${headline}**${m.machineName ? ` (${m.machineName})` : ''}`,
       language === 'de'
         ? `✅ ${succeeded} ok · ❌ ${failed} Fehler${skipped > 0 ? ` · ⏭ ${skipped} übersprungen` : ''} · 📦 ${total} gesamt · ⏱ ${duration}`
         : `✅ ${succeeded} succeeded · ❌ ${failed} failed${skipped > 0 ? ` · ⏭ ${skipped} skipped` : ''} · 📦 ${total} total · ⏱ ${duration}`
@@ -92,7 +92,7 @@ function buildWebhookRequest(url, summary, meta) {
   } else {
     body = JSON.stringify({
       event: 'batch-done',
-      app: 'multi-hoster-upload',
+      app: 'multi-hoster-uploader',
       version: m.appVersion || null,
       machine: m.machineName || null,
       total,