Fix location dropdowns silently truncating at the 100-row backend cap

The backend clamps perpage to MAX_PAGE_SIZE (100), so location selectors that requested a large page received only the first page and still got a 200. Late-alphabet locations (past ~C5W) simply went missing from every module's dropdown, and no error surfaced.

Add locationsApi.listAll, which pages through the full set via fetchAllPages, matching the established machines/printers pattern, and switch every location selector consumer to it.

plugins/computers/frontend/views/PCForm.vue

@@ -472,7 +472,7 @@ onMounted(async () => {
       assetsApi.statuses.list(),
       vendorsApi.list({ perpage: 100 }),
       modelsApi.listAll({ category: 'PC' }),  // backend caps perpage at 100; page through all
-      locationsApi.list({ perpage: 100 }),
+      locationsApi.listAll(),  // backend caps perpage at 100; page through all
       operatingsystemsApi.list({ perpage: 100 }),
       computersApi.protocols.list(),
       // Handles its own failure: a site without printers still gets a form.
@@ -482,7 +482,7 @@ onMounted(async () => {
     statuses.value = statusRes.data.data || []
     vendors.value = vendorRes.data.data || []
     models.value = allModels
-    locations.value = locRes.data.data || []
+    locations.value = locRes || []
     operatingsystems.value = osRes.data.data || []
     protocols.value = protoRes.data.data || []