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>
Merges the full git history of Inventory_frontend into the monorepo
under frontend/. Removes the submodule in favor of a unified repo.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>