fix Gemini structured output for 3 series models and adapt schema

Author: ilvalerione

src/Providers/Gemini/HandleStructured.php

@@ -11,6 +11,7 @@
 use function end;
 use function is_array;
 use function json_encode;
+use function in_array;
 
 /**
  * Structured outputs with tools is available only for the Gemini 3 series models.

tests/Workflow/Persistence/DatabasePersistenceTest.php

@@ -306,7 +306,7 @@ public function testMultipleWorkflowsCanBeSavedIndependently(): void
 
         try {
             $workflow1->start()->getResult();
-        } catch (WorkflowInterrupt $interrupt) {
+        } catch (WorkflowInterrupt) {
             // Expected
         }