🔒 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/Support/NostrAuth.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Support;
+
+use App\Auth\NostrUser;
+use Illuminate\Support\Facades\Session;
+use Illuminate\Support\Facades\Auth;
+
+class NostrAuth
+{
+    /**
+     * Login a user by their Nostr pubkey
+     */
+    public static function login(string $pubkey): void
+    {
+        Auth::guard('nostr')->loginByPubkey($pubkey);
+        Session::regenerate();
+    }
+
+    /**
+     * Logout the current Nostr user
+     */
+    public static function logout(): void
+    {
+        if (Auth::guard('nostr')->check()) {
+            Session::flush();
+        }
+    }
+
+    /**
+     * Get the currently authenticated Nostr user
+     */
+    public static function user(): ?NostrUser
+    {
+        return Auth::guard('nostr')->user();
+    }
+
+    /**
+     * Check if a Nostr user is authenticated
+     */
+    public static function check(): bool
+    {
+        return Auth::guard('nostr')->check();
+    }
+
+    /**
+     * Get the current pubkey (convenience method)
+     */
+    public static function pubkey(): ?string
+    {
+        return self::user()?->getPubkey();
+    }
+
+    /**
+     * Get the current pleb (convenience method)
+     */
+    public static function pleb(): ?object
+    {
+        return self::user()?->getPleb();
+    }
+}