chore: update OpenAPI spec from monorepo (#543)

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

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -26952,8 +26952,10 @@ paths:
                   type: 'string'
                 input:
                   anyOf:
-                    - type: 'string'
+                    - minLength: 1
+                      type: 'string'
                     - items:
+                        minLength: 1
                         type: 'string'
                       type: 'array'
                     - items:
@@ -26971,6 +26973,7 @@ paths:
                               oneOf:
                                 - properties:
                                     text:
+                                      minLength: 1
                                       type: 'string'
                                     type:
                                       enum:
@@ -26999,6 +27002,7 @@ paths:
                                 - $ref: '#/components/schemas/ContentPartInputAudio'
                                 - $ref: '#/components/schemas/ContentPartInputVideo'
                                 - $ref: '#/components/schemas/ContentPartInputFile'
+                            minItems: 1
                             type: 'array'
                         required:
                           - 'content'