task: #3609150 Use the drupal/varbase_recipes module for the config action and drop vardot/varbase-patches

Closes #3609150.

Makes Varbase AI self-contained on both Varbase lines it ships on — 9.2.x (Drupal ~11.4) and 10.1.x (Drupal ~11.4) — following the Varbase Recipes logic:

• Adds drupal/varbase_recipes (^1.0) to require. That module provides the setAiContextItemsDefaultScope config action, which applies a default scope to imported ai_context_item entities after a recipe's content step (Drupal core normalises map fields to {} on config/content import, so the scope can't be shipped through YAML — this is what the old patch did).
• Removes the vardot/varbase-patches requirement from composer.json (patches are managed at the project level in vardot/varbase-project), which unblocks resolution on a Varbase 9.2.x / 10.1.x site.

No plugin is bundled into varbase_ai — it depends on the varbase_recipes module for the action.

AI-Generated: Yes (Used Claude Code to depend on drupal/varbase_recipes for the config action and drop the varbase-patches dependency), reviewed and authorized by the maintainer, per the AI contribution policy.

Checkpoints

• File an issue about this project
• Addition/Change/Update/Fix to this project
• Testing to ensure no regression
• Automated unit/functional testing coverage
• Developer Documentation support on feature change/addition
• User Guide Documentation support on feature change/addition
• UX/UI designer responsibilities
• Accessibility and Readability
• Reviewed by a human
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Update Release Notes
• Release