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

prisma/migrations/20260708012459_add_category_subscription_level_join/migration.sql

@@ -0,0 +1,19 @@
+-- DropIndex
+DROP INDEX "Proclamation_subscriptionLevelId_idx";
+
+-- AlterTable
+ALTER TABLE "Proclamation" ALTER COLUMN "subscriptionLevelId" DROP DEFAULT;
+
+-- CreateTable
+CREATE TABLE "ProclamationCategorySubscriptionLevel" (
+    "categoryId" INTEGER NOT NULL,
+    "subscriptionLevelId" INTEGER NOT NULL,
+
+    CONSTRAINT "ProclamationCategorySubscriptionLevel_pkey" PRIMARY KEY ("categoryId","subscriptionLevelId")
+);
+
+-- AddForeignKey
+ALTER TABLE "ProclamationCategorySubscriptionLevel" ADD CONSTRAINT "ProclamationCategorySubscriptionLevel_categoryId_fkey" FOREIGN KEY ("categoryId") REFERENCES "ProclamationCategory"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "ProclamationCategorySubscriptionLevel" ADD CONSTRAINT "ProclamationCategorySubscriptionLevel_subscriptionLevelId_fkey" FOREIGN KEY ("subscriptionLevelId") REFERENCES "SubscriptionLevel"("id") ON DELETE CASCADE ON UPDATE CASCADE;