chore(inference): disable Call 1 end-to-end; Call 2 stays

overnight-whole-app: Call 1 (vision classification) is OUT.
- POST /api/v1/slabs/{id}/inference/call1 always returns 410 call1_disabled
  (no model chat, no inference_log). Prompt seed/revision APIs kept dormant.
- Review: remove "Suggest with AI" / runInference (inferTaxon).
- GenerateText: remove Classify metadata (Call 1) button; Call 2 generate stays.
- PROMPTS.md banner documents Call 1 OUT / Call 2 STAYS.
- Settings: inference_enabled toggle annotated as Call-1 latch (dormant).
- Backend tests updated to assert 410; Call 2 tests unchanged.

frontend/src/create/inference/GenerateText.svelte

@@ -3,7 +3,6 @@
   let contentEnabled = false;
   let reachable = false;
   let description: string | null = null;
-  let call1Suggestions: Record<string, unknown> | null = null;
   let error = '';
   let busy = false;
 
@@ -41,25 +40,6 @@
     busy = false;
   }
 
-  async function classify() {
-    if (!slabId) {
-      error = 'Enter a slab id.';
-      return;
-    }
-    busy = true;
-    error = '';
-    call1Suggestions = null;
-    try {
-      const res = await fetch(`/api/v1/slabs/${encodeURIComponent(slabId)}/inference/call1`, { method: 'POST' });
-      const body = await res.json();
-      if (res.ok) call1Suggestions = body.suggestions;
-      else error = body.error?.message || `call1 failed (${res.status})`;
-    } catch {
-      error = 'network error';
-    }
-    busy = false;
-  }
-
   checkReadiness();
 </script>
 
@@ -68,6 +48,7 @@
   <p class="state">
     Content generation: {contentEnabled ? 'on' : 'off'} · endpoint: {reachable ? 'reachable' : 'unreachable'}
   </p>
+  <p class="note">Call 1 (vision classification) is disabled on this branch. Call 2 description generation stays.</p>
   {#if !contentEnabled || !reachable}
     <p class="note">The Generate text control is disabled: it appears only when content generation is
       enabled and the inference endpoint is reachable.</p>
@@ -78,13 +59,9 @@
     </div>
     <div class="row">
       <button on:click={generate} disabled={busy}>{busy ? 'Working…' : 'Generate description (Call 2)'}</button>
-      <button on:click={classify} disabled={busy}>Classify metadata (Call 1)</button>
     </div>
     {#if error}<p class="err">{error}</p>{/if}
     {#if description}<p class="desc">{description}</p>{/if}
-    {#if call1Suggestions}
-      <pre class="sug">{JSON.stringify(call1Suggestions, null, 2)}</pre>
-    {/if}
   {/if}
   <button class="mini" on:click={checkReadiness}>Recheck readiness</button>
 </div>
@@ -98,6 +75,5 @@
   .note { color: #e8a; }
   .err { color: #e88; }
   .desc { margin-top: 12px; }
-  .sug { background: #1c1c1c; padding: 8px; }
   .mini { margin-top: 12px; font-size: 12px; }
 </style>