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>

image-recipe/scripts/install-podman.sh

@@ -26,15 +26,12 @@ EOF
 
 # Configure registries (use Docker Hub and quay.io)
 mkdir -p /home/archipelago/.config/containers/registries.conf.d
-cat > /home/archipelago/.config/containers/registries.conf.d/000-shortnames.conf <<EOF
-[registries.search]
-registries = ['git.tx1138.com', 'docker.io', 'quay.io', 'ghcr.io']
+cat > /home/archipelago/.config/containers/registries.conf <<EOF
+unqualified-search-registries = ["docker.io", "ghcr.io", "quay.io", "git.tx1138.com"]
 
-[registries.insecure]
-registries = ['git.tx1138.com']
-
-[registries.block]
-registries = []
+[[registry]]
+location = "git.tx1138.com"
+insecure = true
 EOF
 
 # Set up subuid and subgid for rootless containers