feat: add QR code generator and Nostr event handling

- Added the `simplesoftwareio/simple-qrcode` package to the project
- Created a new JavaScript file `nostrZap.js` to handle Nostr events
- Added the `nostrZap` function to the Alpine.js data property in `app.js`
- Updated the `services.php` configuration file to include the `nostr` environment variable
- Created a new database migration to add a `payment_event` field to the `einundzwanzig_plebs` table
- Made adjustments in the `Election:year.blade.php` view file to handle potential null values
- Updated `composer.lock` and `package.json` with the new dependencies

resources/js/nostrZap.js

@@ -0,0 +1,58 @@
+import NDK, {NDKEvent} from "@nostr-dev-kit/ndk";
+import {
+    nip57,
+} from "nostr-tools";
+
+export default (livewireComponent) => ({
+
+    invoice: livewireComponent.entangle('invoice', true),
+
+    async zap(message, sender, amountToPay) {
+        const ndk = new NDK({
+            explicitRelayUrls: ['wss://simple-relay.steuernsindraub21.xyz'],
+            enableOutboxModel: false,
+        });
+        // Now connect to specified relays
+        await ndk.connect();
+        const event = await ndk.fetchEvent({
+            kinds: [32121],
+            authors: ['daf83d92768b5d0005373f83e30d4203c0b747c170449e02fea611a0da125ee6']
+        });
+        const amount = amountToPay * 1000;
+        console.log('event', event);
+
+        const zapEndpoint = 'https://getalby.com/lnurlp/portaleinundzwanzig/callback';
+
+        const zapEvent = nip57.makeZapRequest({
+            profile: sender,
+            event: event.id,
+            amount: amount,
+            relays: ['wss://simple-relay.steuernsindraub21.xyz'],
+            comment: message,
+        });
+        console.log('zapEvent', zapEvent);
+
+        const signedEvent = await window.nostr.signEvent(zapEvent);
+        console.log('signedEvent', signedEvent);
+
+        let url = `${zapEndpoint}?amount=${amount}&nostr=${encodeURIComponent(
+            JSON.stringify(signedEvent)
+        )}`;
+        url = `${url}&comment=${encodeURIComponent(message)}`;
+        console.log('url', url);
+
+        const res = await fetch(url);
+        const { pr: invoice, reason, status } = await res.json();
+
+        if (invoice) {
+            console.log('invoice', invoice);
+            this.invoice = invoice;
+        } else if (status === "ERROR") {
+            throw new Error(reason ?? "Unable to fetch invoice");
+        } else {
+            throw new Error("Other error");
+        }
+
+    },
+
+});