proclamation-categories: sub-category management inline in parent form

- Registry: Remove 'parent.name' from listFields (all shown records
  are top-level with no parent), remove 'parent: true' from include
  since unused
- +page.server.ts: Custom load filters to parentId=null (top-level
  only); custom upsert syncs children (create/update/delete) and
  handles P2002 duplicate-name errors; custom delete cascades to
  children first to avoid FK constraint violations
- CategoryForm.svelte: Replace parentId select dropdown with dynamic
  list of sub-category inputs. Each row has a name field and Remove
  button. Pre-populates from record.children when editing existing
  categories. Add Sub-category button appends new rows
- +page.svelte: Remove unused relationOptionsData prop from
  CategoryForm; rename submit button label from 'Update' to 'Save'
- prisma: Add ProclamationCategorySubscriptionLevel join table
  migration and regenerate client
- General: Update TipTap mock, Toast, license-keys page, proclamations
  server/route tests, README, AGENTS.md, and other admin forms

README.md

@@ -6,16 +6,16 @@ SvelteKit 2 + Svelte 5 + Tailwind CSS v4 + Prisma 7 + PostgreSQL + Better-Auth.
 
 Admin CRUD pages at `/admin`. 9 models have per-page routes with modals for create/edit:
 
-| Included | Excluded              |
-| -------- | --------------------- |
-| users    | Session (Better Auth) |
-| profiles | Account (Better Auth) |
-| addresses| Verification (Better Auth) |
-| user-roles | UserProclamations (composite key) |
-| proclamations | |
-| solfeggio-frequencies | |
-| proclamation-categories | |
-| license-keys (list-only) | |
-| subscription-levels | |
+| Included                 | Excluded                          |
+| ------------------------ | --------------------------------- |
+| users                    | Session (Better Auth)             |
+| profiles                 | Account (Better Auth)             |
+| addresses                | Verification (Better Auth)        |
+| user-roles               | UserProclamations (composite key) |
+| proclamations            |                                   |
+| solfeggio-frequencies    |                                   |
+| proclamation-categories  |                                   |
+| license-keys (list-only) |                                   |
+| subscription-levels      |                                   |
 
 See `src/lib/svelte-admin/README.md` for architecture and configuration docs.