fix(search): add localeMap for unsupported Orama languages

Configure language fallbacks for search API to handle languages
not natively supported by Orama (ms, zh-Hans, zh-Hant, ja, ko).
These now fall back to English tokenizer.

Author: harryisfish

app/[lang]/api/search/route.ts

@@ -1,4 +1,21 @@
 import { source } from '@/lib/source';
 import { createFromSource } from 'fumadocs-core/search/server';
 
-export const { GET } = createFromSource(source);
+export const { GET } = createFromSource(source, {
+  localeMap: {
+    // Map unsupported languages to English tokenizer
+    // Orama doesn't support: ms (Malay), zh-Hans, zh-Hant, ja, ko
+    'ms': 'english',
+    'zh-Hans': 'english',
+    'zh-Hant': 'english',
+    'ja': 'english',
+    'ko': 'english',
+    // Supported languages use their native tokenizers
+    'en': 'english',
+    'fr': 'french',
+    'es': 'spanish',
+    'pt': 'portuguese',
+    'id': 'indonesian',
+    'ru': 'russian',
+  },
+});