Rebuild admin pages around DataTable/AdminModal; restructure categories/groups and v2 groups API

Remove the generic $lib/svelte-admin CRUD layer and AdminTable.svelte; each
admin route now owns its own form/modal logic. Add DataTable.svelte,
superform-errors.ts, and profile-specific modal/field components.

Flatten proclamation categories/groups and drop subscription levels; add the
v2 groups API; update v1/v2 endpoints, serializers, auth, and regenerated
Prisma client with the new migrations.

Document the overhaul plan in docs/ADMIN_OVERHAUL.md.

docs/ai/api.md

@@ -89,8 +89,8 @@ POST:
 Payload:
 
 {
-	"license_key": "...",
-	"email_address": "..."
+"license_key": "...",
+"email_address": "..."
 }
 
 Requires API key.
@@ -153,7 +153,6 @@ Variables:
 - verifyUrl
 - loginUrl
 
-
 license-key-delivery
 
 Variables:
@@ -161,7 +160,6 @@ Variables:
 - firstName
 - license_key
 
-
 email-verification-email
 
 Variables: