Add changelog for 2025-07-16 (#576)

Author: quantstruct-bot

fern/changelog/2025-07-10.mdx

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+# Addition of `keypadInputPlan` for Workflow Calls**
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+You can now configure keypad input handling during workflow calls by specifying `workflow.keypadInputPlan`. This enables interactive features like menu selections or data entry using user keypad inputs.

fern/changelog/2025-07-11.mdx

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+1. **Define Hooks at Workflow Level**: You can now define call-level hooks using `Workflow.hooks` to trigger actions on call events.
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+2. **New Actions Available in Hooks**: Hooks support new actions like `say`, `tool`, `transfer`, and `function`, providing more options to define what happens when a hook is triggered.
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+3. **Hooks Triggered by Additional Events**: Hooks can now be set to trigger on new events such as `Call.ending`, `Customer.speech.timeout`, `Customer.speech.interrupted`, and `Assistant.speech.interrupted`, giving you more flexibility in handling different call scenarios. 
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+4. **Conditional Hook Execution with Filters**: You can use the [`CallHookFilter`](https://api.vapi.ai/api#:~:text=CallHookFilter) to specify conditions under which a hook should trigger, allowing for precise control over hook activation based on call data.
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+5. **Enhanced Prompt Configuration in Actions**: With [`SayHookAction`](https://api.vapi.ai/api#:~:text=SayHookAction), you can configure prompts as a string or an array of messages, providing flexibility in how messages are delivered to callers.

fern/changelog/2025-07-15.mdx

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+1. **Standardized 'Provider Resources' API Summaries and Tags**: The API endpoints for provider resources now have clearer summaries and are grouped under the **Provider Resources** tag, making them easier to find and understand.
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+2. **Added `'westus2'` Azure Region Support**: You can now specify `'westus2'` as a region when configuring Azure credentials, allowing access to services in this new region.
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+3. **Removed `'trial'` Subscription Type**: The `'trial'` option has been removed from subscription types; ensure your application no longer uses `'trial'` and updates to valid subscription types.

fern/changelog/2025-07-16.mdx

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+1. **Addition of `model` property to Workflows**: You can now set a default language model for your workflows using [`Workflow.model`](https://api.vapi.ai/api#:~:text=TrieveKnowledgeBaseImport-,Workflow,-UpdateWorkflowDTO). This simplifies configuration by allowing you to specify the model once for the entire workflow instead of at each node.
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+2. **Removal of `westus2` region from Azure credentials**: The `westus2` region is no longer supported in Azure credential configurations. Update your Azure credentials to use a different region to maintain access to Azure services.
+
+<Warning>
+  The following OpenAI models have been removed and are no longer available: `gpt-4.5-preview`, `o1-preview`, and `o1-preview-2024-09-12`.  
+  Update your workflows to use supported models to avoid interruptions.
+</Warning>