refactor: verwijder MAOSv6 wallet referenties

- Verwijder window.maosv6 provider uit wallet discovery
- Verwijder isMAOS veld uit DetectedWallet type
- Verwijder MAOS badge uit login page
- Update titel naar 'IPFS Portal' (geen MAOS meer)
- Update foutmeldingen naar wallet-agnostisch
- Update tests naar standaard wallet fallback
- 191 tests passing

src/app/admin/payment/page.tsx

@@ -136,8 +136,7 @@ export default function AdminPaymentPage() {
         const switched = await switchToChain270(prov || undefined);
         if (switched) setWrongChain(false);
       }
-      if (window.maosv6) setWalletType('MAOS Wallet');
-      else if (window.ethereum?.isRabby) setWalletType('Rabby');
+      if (window.ethereum?.isRabby) setWalletType('Rabby');
       else if (window.ethereum?.isMetaMask) setWalletType('MetaMask');
       else setWalletType('Wallet');
     } catch (e: unknown) {

src/app/layout.tsx

@@ -4,7 +4,7 @@ import Providers from '@/components/Providers';
 import SWRegister from '@/components/SWRegister';
 
 export const metadata: Metadata = {
-  title: 'MAOS IPFS Portal',
+  title: 'IPFS Portal',
   description: 'Decentralized storage management for your IPFS node',
   manifest: '/manifest.json',
   icons: { icon: '/favicon.svg' },

src/app/login/page.tsx

@@ -108,11 +108,6 @@ export default function LoginPage() {
                     <div className="flex-1 min-w-0">
                       <div className="text-sm font-medium text-surface-200">
                         {dw.name}
-                        {dw.isMAOS && (
-                          <span className="ml-2 text-[10px] px-1.5 py-0.5 rounded-full bg-accent-purple/20 text-accent-purple">
-                            MAOS
-                          </span>
-                        )}
                       </div>
                       <div className="text-xs text-surface-500 mt-0.5">
                         Klik om te verbinden
@@ -143,7 +138,7 @@ export default function LoginPage() {
         {/* Footer */}
         <p className="text-center text-[10px] text-surface-600 mt-6">
           <Shield className="w-3 h-3 inline-block mr-1" />
-          Verbonden met MAOS IPFS node
+          Verbonden met IPFS node
         </p>
       </div>
     </div>

src/app/page.tsx

@@ -38,7 +38,7 @@ export default function LandingPage() {
         {/* Badge */}
         <div className="inline-flex items-center gap-2 px-3 py-1 rounded-full glass text-sm text-surface-400 mb-8">
           <Server className="w-3.5 h-3.5 text-accent-cyan" />
-          <span>MAOSv6 · IPFS Gateway</span>
+          <span>IPFS Gateway</span>
         </div>
 
         {/* Title */}
@@ -108,7 +108,7 @@ export default function LandingPage() {
 
       {/* Footer */}
       <div className="absolute bottom-6 text-xs text-surface-600">
-        MAOSv6 · Chain 270
+        Chain 270
       </div>
     </div>
   );