feat: implement merchant dashboard, secure auth, and short_id system

- Added dedicated merchant dashboard with analytics and transactions
- Implemented API Key based authentication for merchants
- Introduced 8-character Short IDs for merchants to use in URLs
- Refactored checkout and payment intent APIs to support multi-gateway
- Enhanced Landing Page with Merchant Portal access and marketing copy
- Fixed Next.js 15 async params build issues
- Updated internal branding to P2CGateway
- Added AyrisTech credits to footer

app/api/merchants/route.ts

@@ -0,0 +1,70 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { supabaseAdmin } from '@/lib/supabase-admin';
+
+export async function POST(req: NextRequest) {
+    try {
+        const { name, webhook_url, payment_provider, provider_config } = await req.json();
+
+        if (!name) {
+            return NextResponse.json(
+                { error: 'Firma adı zorunludur.' },
+                { status: 400 }
+            );
+        }
+
+        // Generate a 8-character short ID (e.g., P2C-A1B2C3)
+        const generateShortId = () => {
+            const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
+            let result = '';
+            for (let i = 0; i < 8; i++) {
+                result += chars.charAt(Math.floor(Math.random() * chars.length));
+            }
+            return result;
+        };
+
+        const { data, error } = await supabaseAdmin
+            .from('merchants')
+            .insert([{
+                name,
+                webhook_url,
+                short_id: generateShortId(),
+                payment_provider: payment_provider || 'stripe',
+                provider_config: provider_config || {}
+            }])
+            .select()
+            .single();
+
+        if (error) {
+            console.error('Merchant creation error:', error);
+            return NextResponse.json({ error: error.message }, { status: 500 });
+        }
+
+        return NextResponse.json(data);
+    } catch (err: any) {
+        console.error('Internal Error:', err);
+        return NextResponse.json(
+            { error: `Internal Server Error: ${err.message}` },
+            { status: 500 }
+        );
+    }
+}
+
+export async function GET() {
+    try {
+        const { data, error } = await supabaseAdmin
+            .from('merchants')
+            .select('*')
+            .order('created_at', { ascending: false });
+
+        if (error) {
+            return NextResponse.json({ error: error.message }, { status: 500 });
+        }
+
+        return NextResponse.json(data);
+    } catch (err: any) {
+        return NextResponse.json(
+            { error: `Internal Server Error: ${err.message}` },
+            { status: 500 }
+        );
+    }
+}