WIP: corrections multiples formulaires et sérialisation

- Fix constructeurUtils: réordonner delete/add pour sauvegarder les fournisseurs
- Fix prix/supplierPrice: envoyer en string pour DECIMAL Doctrine
- Fix useMachineTypesApi: normaliser les requirements et forceRefresh
- Fix SearchSelect: watch deep sur baseOptions
- Debug logs temporaires pour pieceRequirements

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/pages/product/create.vue

@@ -425,11 +425,13 @@ const buildPayload = () => {
 
   payload.constructeurIds = uniqueConstructeurIds(creationForm.constructeurIds)
 
-  const rawPrice = creationForm.supplierPrice.trim()
-  if (rawPrice) {
+  const rawPrice = typeof creationForm.supplierPrice === 'string'
+    ? creationForm.supplierPrice.trim()
+    : creationForm.supplierPrice
+  if (rawPrice !== '' && rawPrice !== null && rawPrice !== undefined) {
     const parsed = Number(rawPrice)
     if (!Number.isNaN(parsed)) {
-      payload.supplierPrice = parsed
+      payload.supplierPrice = String(parsed)
     }
   }
 
@@ -486,19 +488,31 @@ const submitCreation = async () => {
 const saveCustomFieldValues = async (productId: string) => {
   const failed: string[] = []
   for (const field of customFieldInputs.value) {
-    if (!field.customFieldId || !field.name) {
+    if (!field.name) {
       continue
     }
     const value = field.value ?? ''
+    const metadata = field.customFieldId
+      ? undefined
+      : { customFieldName: field.name, customFieldType: field.type, customFieldRequired: field.required }
     const result = await upsertCustomFieldValue(
       field.customFieldId,
       'product',
       productId,
       String(value ?? ''),
-      { customFieldName: field.name, customFieldType: field.type, customFieldRequired: field.required },
+      metadata,
     )
     if (!result.success) {
       failed.push(field.name)
+    } else {
+      const createdValue = result.data
+      if (createdValue?.id) {
+        field.customFieldValueId = createdValue.id
+      }
+      const resolvedId = createdValue?.customField?.id || field.customFieldId
+      if (resolvedId) {
+        field.customFieldId = resolvedId
+      }
     }
   }
   return failed