Dev compose improvements

1. Set the max connections to 20, I frequently see

db-1            | 2026-08-23 08:57:02.784 UTC [12641] FATAL:  sorry, too many clients already

2. Add a wildcard route in Traefik to serve DID documents locally.

3. Expose the PLC port locally so I can point an app at `http://localhost:2582` and be able to do full OAuth flows.

docker-compose.yaml

@@ -96,6 +96,8 @@ services:
     depends_on:
       db:
         condition: service_healthy
+    ports:
+      - "2582:2582"
 
   mailpit:
     profiles: [dev]