serve assets and the store archive from gitea-watch (the GitHub repo is gone)

github.com/Worph/MetaAppStore answers 404, and with it every jsDelivr
cdn.jsdelivr.net/gh/Worph/MetaAppStore@main/ URL: the icons, thumbnails and
screenshots of all 44 apps were missing from the store listing, and the store
source in the README no longer downloaded.

- Asset URLs in every Apps/*/docker-compose.yml now point at
  https://gitea-watch.nsl.sh/metastar/MetaAppStore/raw/branch/main/Apps/{AppName}/
  (103 of the 109 distinct URLs checked: 200 image/png). The other 6, MetaGateway
  and MetaWatch screenshot-1..3, name files that have never been in this repo.
- README: the store source is https://gitea-watch.nsl.sh/metastar/MetaAppStore/archive/main.zip
  (public, checked to download anonymously).
- CLAUDE.md and CONTRIBUTING.md: the asset rule and its grep guard follow, so an
  import cannot bring back a jsDelivr URL unnoticed.

CLAUDE.md

@@ -11,14 +11,15 @@ that are *not* MetaMesh (Jellyfin, Nextcloud, MetaMCP — third-party
 `metatool-ai` software despite the name, …) stay in `Worph/AppStore` and must
 not be added here.
 
-⚠ **Asset URLs are repo-scoped.** Everything in this repo must reference
-`https://cdn.jsdelivr.net/gh/Worph/MetaAppStore@main/Apps/{AppName}/`. A file
-copied over from `Worph/AppStore` will carry the old
-`.../gh/Worph/AppStore@main/...` URL and its icon will silently 404 in the store
+⚠ **Asset URLs point at this repo on Gitea.** Everything in this repo must reference
+`https://gitea-watch.nsl.sh/metastar/MetaAppStore/raw/branch/main/Apps/{AppName}/`.
+The GitHub repos are gone, so every jsDelivr `cdn.jsdelivr.net/gh/Worph/...` URL
+(this repo's old ones, or `.../gh/Worph/AppStore@main/...` in a file copied over
+from `Worph/AppStore`) 404s and the icon silently disappears from the store
 listing. Grep after any import:
 
 ```bash
-grep -rn 'gh/Worph/AppStore@main' Apps/   # must be empty
+grep -rn 'cdn.jsdelivr.net/gh/Worph' Apps/   # must be empty
 ```
 
 ## Structure
@@ -104,5 +105,5 @@ shared MetaPlugin app requires setting the variable explicitly.
 ```bash
 docker compose -f Apps/{AppName}/docker-compose.yml config   # compose validity
 jq . category-list.json recommend-list.json featured-apps.json
-grep -rn 'gh/Worph/AppStore@main' Apps/                       # must be empty
+grep -rn 'cdn.jsdelivr.net/gh/Worph' Apps/                     # must be empty
 ```