Add sub-categories to affirmation categories

Add self-referential parent/child relation on AffirmationCategory for
   one-level hierarchy. Update AffirmationForm with two-level category and
   sub-category dropdowns, server actions with find-or-create hierarchy
   logic, AffirmationList with Parent

src/lib/generated/prisma/internal/prismaNamespaceBrowser.ts

@@ -194,7 +194,8 @@ export type SolfeggioFrequencyScalarFieldEnum = (typeof SolfeggioFrequencyScalar
 
 export const AffirmationCategoryScalarFieldEnum = {
   id: 'id',
-  name: 'name'
+  name: 'name',
+  parentId: 'parentId'
 } as const
 
 export type AffirmationCategoryScalarFieldEnum = (typeof AffirmationCategoryScalarFieldEnum)[keyof typeof AffirmationCategoryScalarFieldEnum]