Remove standalone podcast-checklist app; admin checklist now uses the existing checklist backend; v2.14.1

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

server.js

@@ -70,7 +70,6 @@ import { register as registerEpisodes } from './server/routes/episodes.js'
 import { register as registerNuggets } from './server/routes/nuggets.js'
 import { register as registerNuggetsHostUpload } from './server/routes/nuggets-host-upload.js'
 import { register as registerNuggetsWorkflow } from './server/routes/nuggets-workflow.js'
-import { register as registerPodcastChecklist } from './server/routes/podcast-checklist.js'
 import { startNuggetsSeafileWatcher } from './server/nuggets-seafile-watcher.js'
 import { register as registerFeed } from './server/routes/feed.js'
 import { register as registerQrCodes } from './server/routes/qr-codes.js'
@@ -129,7 +128,6 @@ registerEpisodes(app)
 registerNuggets(app)
 registerNuggetsHostUpload(app)
 registerNuggetsWorkflow(app)
-registerPodcastChecklist(app)
 registerFeed(app)
 registerQrCodes(app)
 registerBiblePassage(app)