chore(apps): remove six fake bookmark apps

484.kitchen, Arch Presentation, Call the Operator, Next Web News
Network, Syntropy Institute, and T-0 were hardcoded web-only bookmark
apps (no manifests/containers). Removed across the frontend app grid /
curated / marketplace / session / launcher data, the backend
AppMetadata table, their icons, and the nginx /ext/ proxy blocks
(external-app-proxies.conf deleted — nothing installed it anymore).
botfights/nostrudel/gitea keep the shared external-app code paths.

Frontend: vue-tsc clean, 672 tests pass, production build verified
clean of the removed slugs. Backend: cargo check clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/README.md

@@ -31,7 +31,7 @@ Containerized applications for the Archipelago Bitcoin Node OS. All apps run in
 ### Custom & External
 - **indeedhub** — Bitcoin documentary streaming (custom build)
 - **router** — Mesh routing and network management
-- **botfights**, **nwnn**, **484-kitchen**, **call-the-operator**, **arch-presentation**, **syntropy-institute**, **t-zero** — External web apps
+- **botfights** — External web app
 
 ## Manifest Format