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.

traefik.dev.yaml

@@ -18,6 +18,12 @@ http:
       service: frontend
       priority: 1
       tls: {}
+    handles:
+      rule: 'HostRegexp(`^.+\.pds\.test$`)'
+      entryPoints:
+        - websecure
+      service: backend
+      tls: {}
 
   services:
     backend: