chore: update OpenAPI spec from monorepo (#319)

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

Author: robert-j-y

.speakeasy/in.openapi.yaml

@@ -11822,7 +11822,7 @@ components:
                 input_tokens: 100
                 output_tokens: 50
                 server_tool_use: null
-                service_tier: default
+                service_tier: standard
           type: object
       description: Non-streaming response from the Anthropic Messages API with OpenRouter extensions
       example:
@@ -11846,7 +11846,7 @@ components:
           input_tokens: 12
           output_tokens: 15
           server_tool_use: null
-          service_tier: default
+          service_tier: standard
     MessagesStartEvent:
       description: Event sent at the start of a streaming message
       example:
@@ -12027,7 +12027,7 @@ components:
                 input_tokens: 100
                 output_tokens: 50
                 server_tool_use: null
-                service_tier: default
+                service_tier: standard
           required:
             - id
             - type