feat(call2): short/long desc structure in seed (not brand voice)

Call 2 seed now requires benefit-first short + four-part long HTML, returned
as JSON. POST parses and persists both fields; Create-desc gate no longer
requires short (Call 2 writes it). Brand voice/geo stay Settings-injected.

frontend/src/create/review/createDescGate.ts

@@ -1,12 +1,12 @@
 /**
  * Create-desc gate (Call 2): disable Create desc unless these are present.
- * Does NOT require description OR price (price stays publish-only).
+ * Does NOT require short_description, description, or price — Call 2 writes
+ * short + long; price stays publish-only.
  */
 
 export type CreateDescInput = {
   contentLlmEnabled: boolean;
   title: string;
-  shortDescription: string;
   speciesId: number | null | undefined;
   woodCategoryIds: number[];
   primaryCatId: number | '' | null | undefined;
@@ -20,7 +20,6 @@ export type CreateDescInput = {
 export const CREATE_DESC_LABELS: Record<string, string> = {
   content_llm: 'content LLM on',
   title: 'title',
-  short_description: 'short description',
   species: 'species',
   wood_categories: '≥1 wood category',
   primary: 'primary wood category',
@@ -41,7 +40,6 @@ export function missingCreateDesc(input: CreateDescInput): string[] {
   const missing: string[] = [];
   if (!input.contentLlmEnabled) missing.push('content_llm');
   if (!String(input.title ?? '').trim()) missing.push('title');
-  if (!String(input.shortDescription ?? '').trim()) missing.push('short_description');
   if (input.speciesId == null || !Number.isFinite(Number(input.speciesId))) missing.push('species');
   if (!input.woodCategoryIds?.length) missing.push('wood_categories');
   if (!presentId(input.primaryCatId)) missing.push('primary');