feat(forms): add form_binding, form_subjects, form_filter_registry, form_builder configs

Groundwork for S2+ services. Entity Column Registry whitelists valid
Pattern A/C binding targets; subject-type registry enforces morph-map;
filter registry separates filterable columns from bindable ones; builder
config holds limits, webhook policy, captcha, retention, feature flags.
Adds dedicated 'webhooks' Redis queue connection (retry_after 120s).

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

api/config/queue.php

@@ -73,6 +73,15 @@ return [
             'after_commit' => false,
         ],
 
+        'webhooks' => [
+            'driver' => 'redis',
+            'connection' => env('REDIS_QUEUE_CONNECTION', 'default'),
+            'queue' => env('WEBHOOKS_QUEUE', 'webhooks'),
+            'retry_after' => 120,
+            'block_for' => null,
+            'after_commit' => false,
+        ],
+
         'deferred' => [
             'driver' => 'deferred',
         ],