fix: wrap unescaped {{}} references in backticks in structured output schema descriptions (#932)

The model property description in structured output schemas (CreateStructuredOutputDTO,
StructuredOutput, UpdateStructuredOutputDTO) contains liquid template syntax references
like {{structuredOutput}}, {{structuredOutput.name}}, etc. that break MDX/Fern page
rendering when not wrapped in inline code backticks.

This is a re-application of the fix from PR #924 which was overwritten by a subsequent
API schema push.

Linear: DEVREL-491

Co-authored-by: Vapi Tasker <tasker@vapi.ai>

Author: vapi-tasker[bot]

fern/apis/api/openapi.json

@@ -18307,7 +18307,7 @@
         "type": "object",
         "properties": {
           "model": {
-            "description": "This is the model that will be used to extract the structured output.\n\nTo provide your own custom system and user prompts for structured output extraction, populate the messages array with your system and user messages. You can specify liquid templating in your system and user messages.\nBetween the system or user messages, you must reference either 'transcript' or 'messages' with the '{{}}' syntax to access the conversation history.\nBetween the system or user messages, you must reference a variation of the structured output with the '{{}}' syntax to access the structured output definition.\ni.e.:\n{{structuredOutput}}\n{{structuredOutput.name}}\n{{structuredOutput.description}}\n{{structuredOutput.schema}}\n\nIf model is not specified, GPT-4.1 will be used by default for extraction, utilizing default system and user prompts.\nIf messages or required fields are not specified, the default system and user prompts will be used.",
+            "description": "This is the model that will be used to extract the structured output.\n\nTo provide your own custom system and user prompts for structured output extraction, populate the messages array with your system and user messages. You can specify liquid templating in your system and user messages.\nBetween the system or user messages, you must reference either 'transcript' or 'messages' with the `{{}}` syntax to access the conversation history.\nBetween the system or user messages, you must reference a variation of the structured output with the `{{}}` syntax to access the structured output definition.\ni.e.:\n`{{structuredOutput}}`\n`{{structuredOutput.name}}`\n`{{structuredOutput.description}}`\n`{{structuredOutput.schema}}`\n\nIf model is not specified, GPT-4.1 will be used by default for extraction, utilizing default system and user prompts.\nIf messages or required fields are not specified, the default system and user prompts will be used.",
             "oneOf": [
               {
                 "$ref": "#/components/schemas/WorkflowOpenAIModel",
@@ -42707,7 +42707,7 @@
         "type": "object",
         "properties": {
           "model": {
-            "description": "This is the model that will be used to extract the structured output.\n\nTo provide your own custom system and user prompts for structured output extraction, populate the messages array with your system and user messages. You can specify liquid templating in your system and user messages.\nBetween the system or user messages, you must reference either 'transcript' or 'messages' with the '{{}}' syntax to access the conversation history.\nBetween the system or user messages, you must reference a variation of the structured output with the '{{}}' syntax to access the structured output definition.\ni.e.:\n{{structuredOutput}}\n{{structuredOutput.name}}\n{{structuredOutput.description}}\n{{structuredOutput.schema}}\n\nIf model is not specified, GPT-4.1 will be used by default for extraction, utilizing default system and user prompts.\nIf messages or required fields are not specified, the default system and user prompts will be used.",
+            "description": "This is the model that will be used to extract the structured output.\n\nTo provide your own custom system and user prompts for structured output extraction, populate the messages array with your system and user messages. You can specify liquid templating in your system and user messages.\nBetween the system or user messages, you must reference either 'transcript' or 'messages' with the `{{}}` syntax to access the conversation history.\nBetween the system or user messages, you must reference a variation of the structured output with the `{{}}` syntax to access the structured output definition.\ni.e.:\n`{{structuredOutput}}`\n`{{structuredOutput.name}}`\n`{{structuredOutput.description}}`\n`{{structuredOutput.schema}}`\n\nIf model is not specified, GPT-4.1 will be used by default for extraction, utilizing default system and user prompts.\nIf messages or required fields are not specified, the default system and user prompts will be used.",
             "oneOf": [
               {
                 "$ref": "#/components/schemas/WorkflowOpenAIModel",
@@ -42824,7 +42824,7 @@
         "type": "object",
         "properties": {
           "model": {
-            "description": "This is the model that will be used to extract the structured output.\n\nTo provide your own custom system and user prompts for structured output extraction, populate the messages array with your system and user messages. You can specify liquid templating in your system and user messages.\nBetween the system or user messages, you must reference either 'transcript' or 'messages' with the '{{}}' syntax to access the conversation history.\nBetween the system or user messages, you must reference a variation of the structured output with the '{{}}' syntax to access the structured output definition.\ni.e.:\n{{structuredOutput}}\n{{structuredOutput.name}}\n{{structuredOutput.description}}\n{{structuredOutput.schema}}\n\nIf model is not specified, GPT-4.1 will be used by default for extraction, utilizing default system and user prompts.\nIf messages or required fields are not specified, the default system and user prompts will be used.",
+            "description": "This is the model that will be used to extract the structured output.\n\nTo provide your own custom system and user prompts for structured output extraction, populate the messages array with your system and user messages. You can specify liquid templating in your system and user messages.\nBetween the system or user messages, you must reference either 'transcript' or 'messages' with the `{{}}` syntax to access the conversation history.\nBetween the system or user messages, you must reference a variation of the structured output with the `{{}}` syntax to access the structured output definition.\ni.e.:\n`{{structuredOutput}}`\n`{{structuredOutput.name}}`\n`{{structuredOutput.description}}`\n`{{structuredOutput.schema}}`\n\nIf model is not specified, GPT-4.1 will be used by default for extraction, utilizing default system and user prompts.\nIf messages or required fields are not specified, the default system and user prompts will be used.",
             "oneOf": [
               {
                 "$ref": "#/components/schemas/WorkflowOpenAIModel",
@@ -63456,4 +63456,4 @@
       }
     }
   }
-}
+}