admin: category drag-and-drop reorder + modal-based license key management

- Add sortOrder column to ProclamationCategory with migration
- Implement drag-and-drop reorder in AdminTable with persist-to-DB
- Refactor AdminTable to use $derived + dragOverride (no $effect sync)
- Replace window.location.reload with invalidateAll for reorder

- Convert license key create to modal with subscription level dropdown
- Add LicenseKeyForm.svelte following the CategoryForm pattern
- Add replace action (delete + generate new key with same level)
- Remove deactivateOld checkbox; each key has its own level
- Use use:enhance with update() to refresh list after create/replace

prisma/migrations/20260708153915_add_sort_order_to_category/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "ProclamationCategory" ADD COLUMN     "sortOrder" INTEGER NOT NULL DEFAULT 0;

prisma/schema.prisma

@@ -149,6 +149,7 @@ model SolfeggioFrequency {
 model ProclamationCategory {
   id               Int                                    @id @default(autoincrement())
   name             String
+  sortOrder        Int                                    @default(0)
   parentId         Int?
   parent           ProclamationCategory?                  @relation("CategoryHierarchy", fields: [parentId], references: [id])
   children         ProclamationCategory[]                 @relation("CategoryHierarchy")