feat: add API optimizations, cache invalidation and comprehensive test suite

- Add abort controllers and request deduplication to composables
- Add entity type cache invalidation on create/update/delete flows
- Add 179 new tests (utilities, services, composables, components)
- Fix Vue runtime warnings in structure editors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/components/PieceModelStructureEditor.vue

@@ -118,7 +118,6 @@
                 type="text"
                 class="input input-bordered input-xs"
                 placeholder="Nom du champ"
-                :disabled="isFieldLocked(field)"
               >
               <select v-model="field.type" class="select select-bordered select-xs" :disabled="isFieldLocked(field)">
                 <option value="text">