feat: implement background payment sync worker and admin trigger UI

app/api/admin/sync-payments/route.ts

@@ -0,0 +1,22 @@
+
+import { NextResponse } from 'next/server';
+import { syncPendingPayments } from '@/lib/sync-worker';
+
+export async function POST(request: Request) {
+    try {
+        // Authenticate admin (simple check for now, can be hardened)
+        // In a real app, check session or API key
+        
+        const results = await syncPendingPayments();
+        
+        return NextResponse.json({
+            success: true,
+            message: "Sync completed",
+            processedCount: results.length,
+            results: results
+        });
+    } catch (error: any) {
+        console.error('[Sync API Error]:', error.message);
+        return NextResponse.json({ success: false, error: error.message }, { status: 500 });
+    }
+}

app/api/transactions/[id]/intent/route.ts

@@ -0,0 +1,30 @@
+
+import { NextRequest, NextResponse } from 'next/server';
+import { db } from '@/lib/db';
+
+export async function POST(
+    req: NextRequest,
+    context: { params: Promise<{ id: string }> }
+) {
+    try {
+        const { id } = await context.params;
+        const { network, token } = await req.json();
+
+        if (!id || !network || !token) {
+            return NextResponse.json({ error: 'Missing required fields' }, { status: 400 });
+        }
+
+        // Update metadata with intent
+        // Using jsonb_set to merge or set properly
+        await db.query(`
+            UPDATE transactions 
+            SET metadata = metadata || jsonb_build_object('intent_network', $2::text, 'intent_token', $3::text)
+            WHERE id = $1
+        `, [id, network, token]);
+
+        return NextResponse.json({ success: true });
+    } catch (error: any) {
+        console.error("[Intent Update Error]:", error.message);
+        return NextResponse.json({ error: error.message }, { status: 500 });
+    }
+}