feat(auth): migrate WhatsApp OTP to otp.wibudev.com with API Key authentication

- Create new wa-service.ts helper library
  - sendWhatsAppOtp(): Send OTP via otp.wibudev.com with Bearer token auth
  - sendWhatsAppOtpLegacy(): Deprecated legacy function for backward compat
  - Proper error handling and response validation

- Update all auth routes to use new WA service:
  - login/route.ts: Use sendWhatsAppOtp for login OTP
  - register/route.ts: Use sendWhatsAppOtp for registration OTP
  - resend/route.ts: Use sendWhatsAppOtp for resend OTP
  - send-otp-register/route.ts: Use sendWhatsAppOtp for registration

- Add environment variables to .env.local:
  - WIBU_WA_API_KEY: JWT token for authentication
  - WIBU_WA_API_URL: https://otp.wibudev.com

Benefits:
✓ Secure authentication with JWT API Key
✓ Centralized WA service for all OTP sending
✓ Better error handling and logging
✓ Consistent API response format
✓ Easy to maintain and extend

API Key Info:
- Name: website-desa-darmasaba
- Description: untuk website desa darmasaba
- Expiration: Feb 12, 2116
- Issued: Mar 05, 2026

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

src/app/api/auth/register/route.ts

@@ -2,6 +2,7 @@ import { NextResponse } from 'next/server';
 import { cookies } from 'next/headers';
 import prisma from '@/lib/prisma';
 import { randomOTP } from '../_lib/randomOTP';
+import { sendWhatsAppOtp } from '@/lib/wa-service';
 
 export async function POST(req: Request) {
   try {
@@ -24,12 +25,18 @@ export async function POST(req: Request) {
     const otpNumber = Number(codeOtp);
 
     const waMessage = `Website Desa Darmasaba - Kode verifikasi Anda: ${codeOtp}`;
-    const waUrl = `https://wa.wibudev.com/code?nom=${encodeURIComponent(nomor)}&text=${encodeURIComponent(waMessage)}`;
-    const waRes = await fetch(waUrl);
-    const waData = await waRes.json();
 
-    if (waData.status !== "success") {
-      return NextResponse.json({ success: false, message: 'Gagal mengirim OTP via WhatsApp' }, { status: 400 });
+    // Send OTP via WhatsApp using authenticated API
+    const waResult = await sendWhatsAppOtp({
+      nomor,
+      message: waMessage,
+    });
+
+    if (!waResult.success) {
+      return NextResponse.json(
+        { success: false, message: waResult.message || 'Gagal mengirim OTP via WhatsApp', debug: waResult.data },
+        { status: 400 }
+      );
     }
 
     // ✅ Simpan OTP ke database