fix: deploy tool push ke remote build bukan origin

Sebelumnya push ke origin (Gitea) dengan branch build/stg, seharusnya ke
remote build (GitHub) branch stg.

scripts/mcp-deploy.ts

@@ -150,7 +150,7 @@ server.tool(
     }
     log.push('✅ Committed')
 
-    const push = await sh(['git', 'push', 'origin', 'HEAD:build/stg'])
+    const push = await sh(['git', 'push', 'build', 'HEAD:stg'])
     if (!push.ok) {
       return { content: [{ type: 'text', text: `❌ git push gagal:\n${push.err}` }] }
     }