feat(api-docs): extract API docs viewer into standalone module

Move the Swagger UI viewer from core (pages/admin/api-docs/) into
modules/api-docs/ as a self-contained module. Create module manifest
with routes, permission, sidebar.admin_nav_item slot, asset group,
and authorization policy. Remove API docs ability from core
OperationsAuthorizationPolicy and UiCapabilityMap. Remove hardcoded
sidebar nav item — now contributed via module slot. Add
admin-automation group meta to sidebar template for module nav items.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/api-docs/web/js/pages/admin-api-docs-index.js

@@ -0,0 +1,16 @@
+const container = document.getElementById('swagger-ui');
+
+if (container && window.SwaggerUIBundle) {
+  window.SwaggerUIBundle({
+    url: container.dataset.specUrl || '',
+    dom_id: '#swagger-ui',
+    deepLinking: false,
+    displayRequestDuration: true,
+    filter: true,
+    docExpansion: 'list',
+    supportedSubmitMethods: [],
+    tryItOutEnabled: false,
+    presets: [window.SwaggerUIBundle.presets.apis],
+    layout: 'BaseLayout',
+  });
+}