fix: IndeedHub port 7778, podman registries v2 format

- IndeedHub container port changed from 7777 to 7778 (7777 used by nostr-relay)
- Nginx proxy updated to route to 7778
- Backend config.rs port mapping updated
- Podman registries.conf switched to v2 format (fixes mixed v1/v2 error)

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

core/archipelago/src/api/rpc/package/config.rs

@@ -786,7 +786,7 @@ pub(super) async fn get_app_config(
             ]),
         ),
         "indeedhub" => (
-            vec!["8190:3000".to_string()],
+            vec!["7778:7777".to_string()],
             vec![],
             vec![
                 "NODE_ENV=production".to_string(),