v0.2.0 (4/N): make:bridge:resource --with-dto + symfony/validator

Closes the input-validation gap that was the audit's headline finding.
The legacy generated controller's `if (isset($data['title']))…` body
accepted any JSON: empty title slipped through, malformed JSON got
swallowed by `?? []`, wrong types were silently coerced via casts.

The --with-dto flag generates:
  - src/Dto/Create<Name>Dto.php — readonly DTO with #[Assert\NotBlank]
    on title and #[Assert\Length(max: 255)]
  - src/Dto/Update<Name>Dto.php — same DTO with all fields nullable
    so PATCH callers send only what changed
  - src/Controller/<Name>Controller.php — same shape as the legacy
    controller but actions dispatch via #[MapRequestPayload]

Validation failures (missing required field, wrong type, malformed
JSON, oversize string) become RFC 7807 application/problem+json
automatically — Symfony's RequestPayloadValueResolver does the work.
No `if-isset` boilerplate, no silent coercion.

Behaviour:
  - --with-dto is opt-in; legacy template still ships unchanged
  - audit suggests flipping to default-on once stable; that's a
    follow-up
  - maker fails loud (composer require hint) if symfony/validator
    isn't autoloadable
  - skeleton + example/todo composer.json pull symfony/validator so
    scaffolded apps work out of the box

Snapshot test exercises both modes (legacy + --with-dto). New
baselines TodoControllerWithDto.php / CreateTodoDto.php /
UpdateTodoDto.php under tests/snapshot/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

framework/php/tests/snapshot/UpdateTodoDto.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Dto;
+
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * Validated payload for PATCH /api/todos/{id}.
+ *
+ * All fields are nullable so PATCH callers can send only the fields
+ * they want to change. The controller checks each for null and
+ * skips the corresponding entity setter.
+ */
+final readonly class UpdateTodoDto
+{
+    public function __construct(
+        #[Assert\Length(max: 255)]
+        public ?string $title = null,
+        public ?bool $done = null,
+    ) {
+    }
+}