Refactor: Fully migrated to direct PostgreSQL, implemented Public API v1, fixed Vercel deployment conflicts, and updated documentation

app/merchant/[id]/(dashboard)/layout.tsx

@@ -8,7 +8,7 @@ import {
     ShieldCheck
 } from 'lucide-react';
 import MerchantSidebar from '@/components/merchant/MerchantSidebar';
-import { supabaseAdmin } from '@/lib/supabase-admin';
+import { db } from '@/lib/db';
 
 export default async function MerchantLayout({
     children,
@@ -26,11 +26,8 @@ export default async function MerchantLayout({
     let resolvedId = identifier;
 
     if (!isUUID) {
-        const { data: merchant } = await supabaseAdmin
-            .from('merchants')
-            .select('id')
-            .eq('short_id', identifier)
-            .single();
+        const result = await db.query('SELECT id FROM merchants WHERE short_id = $1 LIMIT 1', [identifier]);
+        const merchant = result.rows[0];
         if (merchant) {
             resolvedId = merchant.id;
         }