simplify MCPHub extensions and restore Hermes web tools

platform/mcphub/casaderoll-entrypoint.sh

@@ -23,8 +23,15 @@ export JWT_SECRET
 # This makes image upgrades reproducible instead of relying on manual edits in
 # MCPHub's database/UI.
 settings_file="$state_dir/mcp_settings.json"
+registry_dir="$state_dir/config"
+registry_file="$registry_dir/mcp-registry.json"
+mkdir -p "$registry_dir" "$state_dir/extensions" "$state_dir/work"
+if [ ! -s "$registry_file" ]; then
+  cp /opt/casaderoll/config/mcp-registry.json "$registry_file"
+  chmod 0600 "$registry_file"
+fi
 python3 /opt/casaderoll/configure-settings.py \
   "$settings_file" /run/secrets/mcphub \
-  --registry /opt/casaderoll/config/mcp-registry.json
+  --registry "$registry_file"
 
 exec "$@"