Migrate /database view to use bulk allowed_resources()

Replace one-by-one permission checks with bulk allowed_resources() call:
- DatabaseView and QueryView now fetch all allowed tables once
- Filter views and tables using pre-fetched allowed_table_set
- Update TableResource.resources_sql() to include views from catalog_views

This improves performance by reducing permission checks from O(n) to O(1) per
table/view, where n is the number of tables in the database.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

datasette/resources.py

@@ -48,6 +48,9 @@ class TableResource(Resource):
         return """
             SELECT database_name AS parent, table_name AS child
             FROM catalog_tables
+            UNION ALL
+            SELECT database_name AS parent, view_name AS child
+            FROM catalog_views
         """