fix(setup): stop the wizard step promising data it does not create

The step was called "Starter Data" and offered to "seed the data a new site
needs", but seed_starter inserts eight vendor rows and nothing else: no assets,
locations, departments or statuses. An operator ran it, saw every dashboard
count stay at zero, and reasonably concluded the seed was broken.

Rename the step to Reference Data, describe what is actually seeded, and say
outright that no assets are created and that an empty dashboard is expected
here. Assets arrive later via the import API.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

frontend/src/views/SetupWizard.vue

@@ -117,8 +117,9 @@
 
         <!-- Starter data -->
         <div v-else-if="current.key === 'data'">
-          <h2>Starter data</h2>
-          <p class="hint">Seed the data a new site needs. Both are idempotent - safe to run more than once.</p>
+          <h2>Reference data</h2>
+          <p class="hint">Seed the lookup data a new site needs: statuses, types, permissions, and a short list of common vendors. Both are idempotent - safe to run more than once.</p>
+          <p class="hint">This does not create any assets. The site starts empty and assets are loaded afterwards via the import API, so an empty dashboard here is expected.</p>
           <div class="starter-actions">
             <div>
               <button class="btn btn-secondary" :disabled="seeding" @click="seedReference">
@@ -181,7 +182,7 @@ const steps = [
   { key: 'site', label: 'Site' },
   { key: 'plugins', label: 'Features' },
   { key: 'map', label: 'Floor Map' },
-  { key: 'data', label: 'Starter Data' },
+  { key: 'data', label: 'Reference Data' },
   { key: 'finish', label: 'Finish' },
 ]
 const step = ref(0)