🔒 Add Nostr authentication support with custom guard and user provider

🛠️ Integrate Nostr auth across relevant components and views
📦 Update config, routes, and service provider for Nostr auth

app/Auth/NostrUserProvider.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Auth;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Contracts\Auth\UserProvider;
+
+class NostrUserProvider implements UserProvider
+{
+    public function retrieveById($identifier): ?Authenticatable
+    {
+        return new NostrUser($identifier);
+    }
+
+    public function retrieveByToken($identifier, $token): ?Authenticatable
+    {
+        return null;
+    }
+
+    public function updateRememberToken(Authenticatable $user, $token): void
+    {
+        //
+    }
+
+    public function retrieveByCredentials(array $credentials): ?Authenticatable
+    {
+        if (isset($credentials['pubkey'])) {
+            return new NostrUser($credentials['pubkey']);
+        }
+
+        return null;
+    }
+
+    public function validateCredentials(Authenticatable $user, array $credentials): bool
+    {
+        return $user instanceof NostrUser && $user->getPubkey() === ($credentials['pubkey'] ?? null);
+    }
+
+    public function rehashPasswordIfRequired(Authenticatable $user, array $credentials, bool $force = false): void
+    {
+        //
+    }
+}