Add manual Micropub token generation for non-PKCE clients

iA Writer's IndieAuth client predates PKCE support in the spec, so it
can't complete the normal authorization flow. Add an admin form to
mint a token directly (reusing the existing TokenService), so it can
be pasted into clients that support manual token setup instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017USyUg8PwuoDcHP8pv5xjy

resources/views/admin/tokens/create.blade.php

@@ -0,0 +1,52 @@
+@extends('master')
+
+@section('title')New Token « Admin CP « @stop
+
+@section('content')
+    <h1>Generate a new token</h1>
+    <p>Use this for clients that can't complete the IndieAuth authorization flow (e.g. they don't support PKCE) and instead let you paste in a token directly.</p>
+
+    <form action="/admin/tokens" method="post" accept-charset="utf-8" class="admin-form form">
+        {{ csrf_field() }}
+
+        <div>
+            <label for="client_id">Client</label>
+            <input
+                type="text"
+                name="client_id"
+                id="client_id"
+                value="{{ old('client_id') }}"
+                placeholder="https://ia.net/writer"
+                required
+            >
+        </div>
+
+        <div class="scope-checkboxes">
+            <span>Scope</span>
+            <label for="scope_create">
+                <input
+                    type="checkbox"
+                    name="scope[]"
+                    id="scope_create"
+                    value="create"
+                    @checked(in_array('create', old('scope', []), true))
+                >
+                create
+            </label>
+            <label for="scope_update">
+                <input
+                    type="checkbox"
+                    name="scope[]"
+                    id="scope_update"
+                    value="update"
+                    @checked(in_array('update', old('scope', []), true))
+                >
+                update
+            </label>
+        </div>
+
+        <div>
+            <button type="submit" name="save">Generate token</button>
+        </div>
+    </form>
+@stop