Store category prompts as EXACT split legacy text, no boilerplate

The per-category prompt editor showed English machine boilerplate
("Role: description. Build JSON …", schema intro, {{var}} context lines)
because seed/sync baked the render framing into categories.prompt. Now the
stored overlay is exactly the legacy wp_product_categories.sql content,
split into the three sections a user would type themselves:

  --- Title ---        Slovenian naming formula
  --- Description ---  legacy <H2>/<p>/<ul> body structure
  --- Meta ---         legacy metaDescription instruction

Schema, role framing, and Name/Description/Category/Attrs product context
stay render-time only (system template + ensureCategoryEnhanceUserContext),
where they already existed.

- SplitLegacyCombinedEnhancePrompt: non-legacy input now returns "" —
  categories without seed/legacy content get their override CLEARED
  (company default) instead of being stuffed with the canonical template
  (e.g. parent categories like "Bela tehnika" absent from the SQL).
- CategoryEnhancePromptNeedsRepair flags stored boilerplate ("parsed as
  JSON", "Build JSON", retired Attributes section) so Sync rewrites old
  data to the clean shape; repair supports clearing (prompt = '{}').
- seed-a1 apply-category-prompts skips instead of writing template text.
- Web editor compose stores only the user's section text: empty sections
  keep bare markers, default bodies and the default preamble are never
  persisted (DEFAULT_SECTION_BODIES removed).
- Verified locally: apply rewrote 238 A1+Demo categories (216 exact
  splits, 22 cleared), zero boilerplate matches in DB, idempotent re-run
  (would_update=0).

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

apps/api/internal/catalog/prompt_repair_test.go

@@ -8,33 +8,33 @@ import (
 	"github.com/descrybe/descrybe-v2/apps/api/internal/company"
 )
 
-func TestRepairedCategoryEnhancePromptMap(t *testing.T) {
+func TestCategoryEnhancePromptMapRepairStates(t *testing.T) {
 	t.Parallel()
-	want, err := repairedCategoryEnhancePromptMap()
-	if err != nil {
-		t.Fatal(err)
+	// Clean split overlay (pure legacy text) is OK under sl and *.
+	split := aiprompts.SplitLegacyCombinedEnhancePrompt(`GPT predloga:
+<name>{Napiši tip izdelka}</name>
+<metaDescription>{140 znakov}</metaDescription>
+<H2>{benefit}</H2>`)
+	if split == "" {
+		t.Fatal("expected split overlay")
 	}
-	tpl := strings.TrimSpace(aiprompts.CategoryEnhanceUserTemplate)
-	if want["sl"] != tpl {
-		t.Fatalf("want prompt->>'sl' = shared template")
+	if !categoryEnhancePromptMapOK(company.LangPromptMap{"sl": split, company.LangPromptAny: split}) {
+		t.Fatal("split overlay map should be OK")
 	}
-	if want[company.LangPromptAny] != tpl {
-		t.Fatalf("want * = shared template")
+	if !categoryEnhancePromptMapOK(company.LangPromptMap{"sl": split}) {
+		t.Fatal("sl-only split map should be OK (idempotent)")
 	}
-	if !categoryEnhancePromptMapOK(want) {
-		t.Fatal("canonical map should be OK")
+	if !categoryEnhancePromptMapOK(company.LangPromptMap{company.LangPromptAny: split}) {
+		t.Fatal("*-only split map should be OK (idempotent)")
 	}
 	legacy := company.LangPromptMap{"sl": "<H2>legacy HTML marketing</H2>"}
 	if categoryEnhancePromptMapOK(legacy) {
 		t.Fatal("legacy HTML must need repair")
 	}
-	slOnly := company.LangPromptMap{"sl": tpl}
-	if !categoryEnhancePromptMapOK(slOnly) {
-		t.Fatal("sl-only repaired map should be OK (idempotent)")
-	}
-	starOnly := company.LangPromptMap{company.LangPromptAny: tpl}
-	if !categoryEnhancePromptMapOK(starOnly) {
-		t.Fatal("*-only repaired map should be OK (idempotent)")
+	// Stored template boilerplate (old seed versions) must need repair → cleared.
+	tpl := strings.TrimSpace(aiprompts.CategoryEnhanceUserTemplate)
+	if categoryEnhancePromptMapOK(company.LangPromptMap{"sl": tpl, company.LangPromptAny: tpl}) {
+		t.Fatal("stored template boilerplate must need repair")
 	}
 }
 
@@ -54,6 +54,28 @@ func TestRepairTargetsUseSharedTemplate(t *testing.T) {
 	}
 }
 
+func TestComputeRepairedEnhancePromptClears(t *testing.T) {
+	t.Parallel()
+	// No seed + no legacy content → clear (fallback), never template boilerplate.
+	prompt, fromSeed, fromLegacy, fallback := computeRepairedEnhancePrompt(
+		company.LangPromptMap{"sl": strings.TrimSpace(aiprompts.CategoryEnhanceUserTemplate)}, "", false)
+	if prompt != "" || fromSeed || fromLegacy || !fallback {
+		t.Fatalf("want clear fallback, got prompt=%q seed=%v legacy=%v fallback=%v", prompt, fromSeed, fromLegacy, fallback)
+	}
+	// Seed legacy → split overlay with the exact Slovenian text.
+	seed := `GPT predloga:
+<name>{Napiši tip izdelka}</name>
+<metaDescription>{140 znakov}</metaDescription>
+<H2>{benefit}</H2>`
+	prompt, fromSeed, fromLegacy, fallback = computeRepairedEnhancePrompt(nil, seed, true)
+	if prompt == "" || !fromSeed || !fromLegacy || fallback {
+		t.Fatalf("want seed split, got prompt=%q seed=%v legacy=%v fallback=%v", prompt, fromSeed, fromLegacy, fallback)
+	}
+	if !strings.Contains(prompt, "140 znakov") || strings.Contains(strings.ToLower(prompt), "build json") {
+		t.Fatalf("split must keep legacy text without boilerplate: %q", prompt)
+	}
+}
+
 func TestLegacyTitleRulesFromSeedShape(t *testing.T) {
 	t.Parallel()
 	seed := `Ustvari nov opis