fix

apps/api/internal/aiprompts/legacy_split.go

@@ -110,6 +110,31 @@ func BuildCategoryEnhanceOverlay(parts LegacyEnhanceParts) string {
 	return strings.TrimSpace(b.String())
 }
 
+// ExtractEnhanceSectionBody returns the text between start/end markers
+// (case-insensitive markers, body preserved). Empty when the start marker is missing.
+func ExtractEnhanceSectionBody(prompt, start, end string) string {
+	raw := strings.ReplaceAll(strings.ReplaceAll(prompt, "\r\n", "\n"), "\r", "\n")
+	lower := strings.ToLower(raw)
+	startL := strings.ToLower(strings.TrimSpace(start))
+	endL := strings.ToLower(strings.TrimSpace(end))
+	if startL == "" {
+		return ""
+	}
+	startIdx := strings.Index(lower, startL)
+	if startIdx < 0 {
+		return ""
+	}
+	bodyStart := startIdx + len(startL)
+	rest := raw[bodyStart:]
+	restLower := lower[bodyStart:]
+	if endL != "" {
+		if endIdx := strings.Index(restLower, endL); endIdx >= 0 {
+			rest = rest[:endIdx]
+		}
+	}
+	return strings.TrimSpace(strings.TrimPrefix(strings.TrimSuffix(rest, "\n"), "\n"))
+}
+
 func cleanLegacyInstruction(s string) string {
 	s = modernizeLegacyPlaceholders(s)
 	s = reDoubledQuotes.ReplaceAllString(s, `"`)