fix(nix): fix GHC 9.10.3 interface-file crash and binary name

Generated.Types imports 119 modules, pushing the combined .hi read past
a ~287 MB binary-deserialization limit in GHC 9.10.3. Fix by adding a
nixpkgs overlay that patches the inter-hub-models derivation: replaces
Generated/Types.hs with a thin TypesPart1/TypesPart2 re-export wrapper
after build-generated-code runs, and adds the two split modules to the
cabal exposed-modules list.

Also fix the production binary name from /bin/App to /bin/RunProdServer
in deployment.yaml and RUNBOOK.md (the IHP NixSupport build produces
RunProdServer, not App). Switch packages.docker to IHP's built-in
unoptimized-docker-image which already uses the correct binary path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy/helm/inter-hub/templates/deployment.yaml

@@ -19,7 +19,7 @@ spec:
         {{- if .Values.runMigrations }}
         - name: migrate
           image: {{ .Values.image.repository }}:{{ .Values.image.tag }}
-          command: ["/bin/App", "migrate"]
+          command: ["/bin/RunProdServer", "migrate"]
           envFrom:
             - secretRef:
                 name: {{ .Values.envFrom.secretRef }}

deploy/railiance/RUNBOOK.md

@@ -49,7 +49,7 @@ IHP migrations run automatically on startup via the init container in the Deploy
 To run migrations manually:
 
 ```bash
-kubectl exec -n inter-hub deploy/inter-hub -- /bin/App migrate
+kubectl exec -n inter-hub deploy/inter-hub -- /bin/RunProdServer migrate
 ```
 
 To check migration status: