chore: update OpenAPI spec from monorepo (#784)

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

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -18194,6 +18194,7 @@ components:
               provider: 'OpenAI'
               selected: true
           total: 1
+        generation_time: 2016
         is_byok: false
         region: 'iad'
         requested: 'openai/gpt-4o'
@@ -18208,6 +18209,10 @@ components:
           type: 'array'
         endpoints:
           $ref: '#/components/schemas/EndpointsMetadata'
+        generation_time:
+          description: 'Milliseconds measured for the generation, from dispatching the upstream request until its response body ended. Divide the completion token count by this for throughput. Absent when no upstream request was dispatched.'
+          example: 2016
+          type: 'integer'
         is_byok:
           type: 'boolean'
         params: