docs: Add delete locks documentation

pages/platform/delete-locks.mdx

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+---
+title: Delete Locks
+navigation_icon: lock
+---
+
+Delete locks prevent accidental deletion of instances and volumes.
+When you set a delete lock on a resource, any attempt to delete it returns an error until you remove it.
+
+Delete locks apply to:
+- Instances
+- Instance templates
+- Volumes
+- Volume templates
+
+## Enabling a delete lock
+
+Set a delete lock on an instance via the `PATCH` endpoint:
+
+```bash title=""
+kraft cloud instance update <instance-name> --delete-lock
+```
+
+Set a delete lock on a volume:
+
+```bash title=""
+kraft cloud volume update <volume-name> --delete-lock
+```
+
+## Removing a delete lock
+
+Remove the delete lock before deleting:
+
+```bash title=""
+kraft cloud instance update <instance-name> --no-delete-lock
+kraft cloud volume update <volume-name> --no-delete-lock
+```
+
+## Checking the delete lock status
+
+The instance and volume status responses include a `delete_lock` field:
+
+```bash title=""
+kraft cloud instance get <instance-name>
+kraft cloud volume get <volume-name>
+```
+
+## Behaviour
+
+- **Deletion blocked**: Any `DELETE` request on a locked resource returns an error.
+- **Autokill skipped**: The autokill subsystem skips instances and service groups that have a delete lock set.
+  The autokill timer doesn't fire while the lock is active.
+- **Templates**: Delete locks are independently configurable on instance templates and volume templates via their respective `PATCH` endpoints.
+
+## Learn more
+
+* Unikraft Cloud's [REST API reference](/api/platform/v1), in particular the sections on [instances](/api/platform/v1/instances) and [volumes](/api/platform/v1/volumes)