fix(i18n): 印尼语内容缺失时不再回退中文

lib/core/data/models/drama.dart

@@ -241,11 +241,11 @@ class Drama {
   }
 
   String localizedTitle(String languageCode) {
-    return localizedText(languageCode, title, titleLocales);
+    return localizedRequiredText(languageCode, title, titleLocales);
   }
 
   String localizedSynopsis(String languageCode) {
-    return localizedText(languageCode, synopsis, synopsisLocales);
+    return localizedRequiredText(languageCode, synopsis, synopsisLocales);
   }
 
   String localizedTag(String languageCode) {

lib/core/data/models/locale_text.dart

@@ -7,10 +7,27 @@ Map<String, String> localeMap(Object? raw) {
 }
 
 /// 按当前语言取文案。没有对应语言时用中文，中文也没有时用 fallback。
-String localizedText(String languageCode, String fallback, Map<String, String> locales) {
+String localizedText(
+  String languageCode,
+  String fallback,
+  Map<String, String> locales,
+) {
   final selected = locales[languageCode] ?? '';
   if (selected.isNotEmpty) return selected;
   final chinese = locales['zh'] ?? '';
   if (chinese.isNotEmpty) return chinese;
   return fallback;
 }
+
+/// 按当前语言取必须本地化的文案；印尼语缺失时不回退中文。
+String localizedRequiredText(
+  String languageCode,
+  String fallback,
+  Map<String, String> locales,
+) {
+  final primaryCode = languageCode.split(RegExp(r'[_-]')).first;
+  final selected = locales[languageCode] ?? locales[primaryCode] ?? '';
+  if (selected.trim().isNotEmpty) return selected;
+  if (primaryCode == 'id') return '';
+  return localizedText(primaryCode, fallback, locales);
+}