feat: add Solana USDT/USDC support and refine admin payouts UI

app/api/merchants/route.ts

@@ -48,8 +48,37 @@ export async function POST(req: NextRequest) {
 
 export async function GET() {
     try {
-        const result = await db.query('SELECT * FROM merchants ORDER BY created_at DESC');
-        return NextResponse.json(result.rows);
+        const merchantsResult = await db.query('SELECT * FROM merchants ORDER BY created_at DESC');
+        const merchants = merchantsResult.rows;
+
+        // Fetch breakdown per merchant
+        const breakdownResult = await db.query(`
+            SELECT 
+                merchant_id, 
+                COALESCE(paid_network, 'SİSTEM') as network, 
+                COALESCE(paid_token, 'TRY') as token, 
+                SUM(COALESCE(paid_amount_crypto, amount)) as amount
+            FROM transactions 
+            WHERE status = 'succeeded'
+            GROUP BY merchant_id, paid_network, paid_token
+        `);
+
+        const breakdowns = breakdownResult.rows.reduce((acc: any, row: any) => {
+            if (!acc[row.merchant_id]) acc[row.merchant_id] = [];
+            acc[row.merchant_id].push({
+                network: row.network,
+                token: row.token,
+                amount: row.amount
+            });
+            return acc;
+        }, {});
+
+        const merchantsWithBreakdown = merchants.map(m => ({
+            ...m,
+            balance_breakdown: breakdowns[m.id] || []
+        }));
+
+        return NextResponse.json(merchantsWithBreakdown);
     } catch (err: any) {
         return NextResponse.json(
             { error: `Internal Server Error: ${err.message}` },