fix(ui) : remove legacy edit pages and history composables, unify create/edit forms

Consolidate create and edit pages into single create pages with edit mode support.
Remove obsolete catalog pages, history composables, and fix remaining code review issues.
Include migration to relink orphaned custom fields.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/app/shared/utils/apiHelpers.ts

@@ -5,6 +5,13 @@
  * copy of extractCollection (parsing hydra:member / member / data / array).
  */
 
+export function extractTotal(payload: unknown, fallbackLength: number): number {
+  const p = payload as Record<string, unknown> | null
+  if (typeof p?.totalItems === 'number') return p.totalItems
+  if (typeof p?.['hydra:totalItems'] === 'number') return p['hydra:totalItems']
+  return fallbackLength
+}
+
 export function extractCollection<T = any>(payload: unknown): T[] {
   if (Array.isArray(payload)) return payload as T[]
   const p = payload as Record<string, unknown> | null