refactor : merge Inventory_frontend submodule into frontend/ directory

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>

frontend/app/composables/useComponentHistory.ts

@@ -0,0 +1,12 @@
+/**
+ * Backward-compatible wrapper around useEntityHistory.
+ * Real logic lives in useEntityHistory.ts.
+ */
+import { useEntityHistory, type EntityHistoryActor, type EntityHistoryEntry } from './useEntityHistory'
+
+export type ComponentHistoryActor = EntityHistoryActor
+export type ComponentHistoryEntry = EntityHistoryEntry
+
+export function useComponentHistory() {
+  return useEntityHistory('composant')
+}