chore: update OpenAPI spec from monorepo (#443)

Co-authored-by: OpenRouter SDK Bot <sdk-bot@openrouter.ai>

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -9992,6 +9992,8 @@ components:
         prompt_tokens: 0
         total_tokens: 4175
       properties:
+        cache_creation:
+          $ref: '#/components/schemas/AnthropicCacheCreation'
         completion_tokens:
           description: The tokens generated
           type: integer
@@ -11939,6 +11941,8 @@ components:
           type: string
         usage:
           properties:
+            cache_creation:
+              $ref: '#/components/schemas/AnthropicCacheCreation'
             cache_creation_input_tokens:
               nullable: true
               type: integer