Add admin page to list and revoke Micropub tokens

Gives a way to actually use the revocation capability built up over
the last few commits from the admin side, not just self-service via
the client. Lists client_id/scope/issue time per token (never the raw
token itself, since only its hash is stored) with a revoke button for
active ones.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014625MfkGZ7GVdbqKme4a8L

app/Http/Controllers/Admin/TokensController.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Models\MicropubToken;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\View\View;
+
+class TokensController extends Controller
+{
+    /**
+     * Show a list of issued Micropub tokens.
+     */
+    public function index(): View
+    {
+        $tokens = MicropubToken::latest()->get();
+
+        return view('admin.tokens.index', compact('tokens'));
+    }
+
+    /**
+     * Revoke a Micropub token.
+     */
+    public function revoke(MicropubToken $token): RedirectResponse
+    {
+        $token->revoke();
+
+        return redirect('/admin/tokens');
+    }
+}