feat: dynamic app catalog, Gitea app polish, registry sync

App catalog served from Gitea repos (app-catalog) with 35 apps.
Nodes fetch catalog dynamically — new apps appear without frontend
rebuild. Test app added and removed to verify pipeline.

Gitea manifest updated with internal_port/nginx_proxy for iframe.
Updated catalog.json, nginx configs, app session configs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/appSession/appSessionConfig.ts

@@ -51,9 +51,7 @@ export const APP_PORTS: Record<string, number> = {
 /** Apps that need nginx proxy for iframe embedding.
  *  IndeedHub loads via /app/indeedhub/ proxy for nostr-provider.js injection
  *  from the container's internal nginx so iframe works on all servers. */
-export const PROXY_APPS: Record<string, string> = {
-  'gitea': '/app/gitea/',
-}
+export const PROXY_APPS: Record<string, string> = {}
 
 /** Nginx proxy paths -- used on HTTPS to avoid mixed content (HTTPS parent + HTTP port iframe).
  *  On HTTP, direct port access is used instead (faster, no proxy). */