refactor: remove free membership option and update default to basic in KYC admin page

src/app/admin/kyc/page.tsx

@@ -1155,7 +1155,7 @@ function NewApplicationModal({ isOpen, onClose, onSave }: { isOpen: boolean; onC
     permanentAddress: { sameAsPresent: false, line1: '', line2: '', division: '', district: '', zip: '', country: 'Bangladesh' },
     emergencyContact: { name: '', phone: '', relation: '', email: '', address: '' },
     drivingLicense: { number: '', class: '', issueDate: '', expiryDate: '', status: 'not_applied' },
-    membershipType: 'free',
+    membershipType: 'basic',
     referralCode: '',
     referredBy: '',
     employmentInfo: { company: '', monthlyEarning: 0, whyEV: '', experience: '' },
@@ -1359,7 +1359,6 @@ function NewApplicationModal({ isOpen, onClose, onSave }: { isOpen: boolean; onC
                       onChange={(e) => updateField('membershipType', e.target.value)}
                       className="w-full px-3 py-2 border border-slate-200 rounded-lg text-sm bg-white"
                     >
-                      <option value="free">Free</option>
                       <option value="basic">Basic</option>
                       <option value="premium">Premium</option>
                       <option value="vip">VIP</option>