Capture mesh-catalog at feat/r4g (2246ccc4) with the templates its manifests name and its predefined.json, and lay the copy out as a repository's root

The catalogue's manifests moved their content into template files and fall back to predefined keys, so a copy of
module.json alone no longer passes the catalogue's own check; the bus's Dockerfile is gone from the catalogue.

testdata/beside/mesh-catalog/modules/supabase/files/realtime-env.env

@@ -0,0 +1,16 @@
+PORT=4000
+DB_HOST=supabase-db
+DB_PORT=5432
+DB_USER=supabase_admin
+DB_PASSWORD=${secret:postgres}
+DB_NAME=postgres
+DB_AFTER_CONNECT_QUERY=SET search_path TO _realtime
+DB_ENC_KEY=supabaserealtime
+API_JWT_SECRET=${secret:jwt}
+SECRET_KEY_BASE=${secret:key-base-a}${secret:key-base-b}
+ERL_AFLAGS=-proto_dist inet_tcp
+DNS_NODES=''
+RLIMIT_NOFILE=10000
+APP_NAME=realtime
+SEED_SELF_HOST=true
+RUN_JANITOR=true