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/components/machine/MachineComponentsCard.vue

@@ -0,0 +1,72 @@
+<template>
+  <div class="card bg-base-100 shadow-sm">
+    <div class="card-body">
+      <div class="flex justify-between items-center mb-4">
+        <h2 class="card-title">Composants</h2>
+        <button
+          type="button"
+          class="btn btn-ghost btn-sm gap-2"
+          @click="$emit('toggle-collapse')"
+          :title="collapsed ? 'Déplier tous les composants' : 'Replier tous les composants'"
+        >
+          <IconLucideChevronRight
+            class="w-5 h-5 transition-transform"
+            :class="collapsed ? 'rotate-0' : 'rotate-90'"
+            aria-hidden="true"
+          />
+          <span class="text-sm">
+            {{ collapsed ? 'Tout déplier' : 'Tout replier' }}
+          </span>
+        </button>
+      </div>
+
+      <div v-if="components.length === 0" class="text-sm text-gray-500 py-4">
+        Aucun composant associé à cette machine.
+      </div>
+
+      <div v-else class="space-y-2">
+        <div v-for="component in components" :key="component.id">
+          <ComponentHierarchy
+            :components="[component]"
+            :is-edit-mode="false"
+            :show-delete="isEditMode"
+            :collapse-all="collapsed"
+            :toggle-token="collapseToggleToken"
+            @edit-piece="$emit('edit-piece', $event)"
+            @delete="$emit('remove-component', component.linkId || component.id)"
+          />
+        </div>
+      </div>
+
+      <button
+        v-if="isEditMode"
+        type="button"
+        class="btn btn-sm md:btn-md btn-primary"
+        @click="$emit('add-component')"
+      >
+        Ajouter un composant
+      </button>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import ComponentHierarchy from '~/components/ComponentHierarchy.vue'
+import IconLucideChevronRight from '~icons/lucide/chevron-right'
+
+defineProps<{
+  components: any[]
+  isEditMode: boolean
+  collapsed: boolean
+  collapseToggleToken: number
+}>()
+
+defineEmits<{
+  'toggle-collapse': []
+  'update-component': [component: any]
+  'edit-piece': [piece: any]
+  'custom-field-update': [fieldUpdate: any]
+  'add-component': []
+  'remove-component': [linkId: string]
+}>()
+</script>