Split A1 category prompts canonically; retire attributes prompting

- Category enhance prompts (Sync A1 / seed-a1 / repair) now use the same
  three role sections as the rest of the platform: Title / Description /
  Meta. The retired "--- Attributes ---" role section is removed from the
  canonical template, the legacy-split overlay, and the web prompt editor;
  Category/Attrs stay as plain product-context lines (attribute extraction
  remains pipeline-level via AppendAttributeConstraints).
- Stored prompts still carrying an attributes section are detected by
  CategoryEnhancePromptNeedsRepair and rewritten on the next Sync.
- Legacy wp_product_categories.sql splits now also seed a default Slovenian
  metaTitle rule (dumps only carried <metaDescription>), so every A1
  category gets all four prompt areas: title formula, description
  sections, meta title, meta description.
- Role-sectioned prompts no longer imply the A1 SEO-omit cohort
  (CompanyOmitsSEOMeta): sectioned prompts are the canonical prompt-editor
  output for every tenant, and the sniff silently disabled SEO meta for
  any company that saved a category prompt.
- Verified locally: repair-category-prompts -apply updated 238 A1 +
  Platform Demo categories from scripts/seed/wp_product_categories.sql
  (216 legacy splits), idempotent on re-run, zero attributes sections
  left in DB.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/api/internal/aiprompts/legacy_split.go

@@ -126,11 +126,9 @@ func BuildCategoryEnhanceOverlay(parts LegacyEnhanceParts) string {
 	b.WriteString(SectionMetaEnd)
 	b.WriteString("\n\n")
 
-	b.WriteString(SectionAttributesStart)
-	b.WriteString("\nRole: attributes. Build JSON \"attrs\" as an object of attribute_key → value strings. Prefer Allowed attribute keys / Title formula attr slots that follow; remap near-miss labels onto those keys; fill missing keys only from Name/Description/Category/Attrs evidence; never invent specs; omit unknown keys; never invent dimensions.\n")
+	b.WriteString("Product context:\n")
 	b.WriteString("Category: {{category}}\n")
-	b.WriteString("Attrs: {{attrs}}\n")
-	b.WriteString(SectionAttributesEnd)
+	b.WriteString("Attrs: {{attrs}}")
 	return strings.TrimSpace(b.String())
 }