fix: restore getMessage compatibility and finalize build

lib/directus.ts

@@ -121,6 +121,36 @@ export async function getMessages(locale: string): Promise<Record<string, string
   }
 }
 
+/**
+ * Get a single message by key from Directus
+ */
+export async function getMessage(key: string, locale: string): Promise<string | null> {
+  const directusLocale = toDirectusLocale(locale);
+  const query = `
+    query {
+      messages(filter: {key: {_eq: "${key}"}}, limit: 1) {
+        key
+        translations {
+          value
+          languages_code { code }
+        }
+      }
+    }
+  `;
+
+  try {
+    const result = await directusRequest('', { body: { query } });
+    const messages = (result as any)?.messages;
+    if (!messages || messages.length === 0) return null;
+    
+    const translations = messages[0]?.translations || [];
+    const translation = translations.find((t: any) => t.languages_code?.code === directusLocale);
+    return translation?.value || null;
+  } catch (error) {
+    return null;
+  }
+}
+
 export async function getContentPage(
   slug: string,
   locale: string