Pangolin: point badger apiBaseUrl at FQDN so Traefik in kube-system can reach it

Traefik runs in kube-system, so the short DNS name "pangolin" that Pangolin's
default `internal_hostname` uses does not resolve. Set both
`server.internal_hostname` and `server.badger_override` to
`pangolin.pangolin.svc.cluster.local` so the badger middleware and internal
callbacks resolve from any namespace.

Fixes the HTTP 500 on `https://paperclip.basicstack.de/` after cross-namespace
IngressRoute wiring was fixed in DEV-457.

Refs: DEV-457

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/pangolin/pangolin-config.yaml

@@ -24,6 +24,12 @@ data:
 
     server:
       secret: "REPLACE_WITH_SECRET_FROM_SEALED_SECRET"
+      # DEV-457: Traefik runs in kube-system; the short hostname "pangolin"
+      # (Pangolin's default) doesn't resolve there. Point badger + internal
+      # callbacks at the FQDN so the badger middleware can call back to the
+      # Pangolin API.
+      internal_hostname: "pangolin.pangolin.svc.cluster.local"
+      badger_override: "http://pangolin.pangolin.svc.cluster.local:3001/api/v1"
       cors:
         origins:
           - "https://pangolin.basicstack.de"