Fix TTS output text: audio not image

[ask-bonk]

For melotts, the output is a oneOf schema, so model.schema.output.format is undefined (not "binary"), meaning it falls through to the SchemaViewer component. This is fine — the issue only affects models where the top-level output has format: "binary".

The image models with binary output have contentType values like "image/png" or "image/jpeg", which don't start with "audio/", so they'll still show the original "image in JPEG or PNG format" text.

Here's a summary of the change:

Problem: The model page template at src/pages/workers-ai/models/[name].astro:304 had a hardcoded description for all binary output models saying "The binding returns a ReadableStream with the image in JPEG or PNG format". This is incorrect for text-to-speech models like @cf/deepgram/aura-1, @cf/deepgram/aura-2-en, and @cf/deepgram/aura-2-es, which output audio, not images.

Fix: The template now checks the model's output contentType. If it starts with "audio/", it displays "audio in MPEG format" (derived from the actual content type). Otherwise, it falls back to the existing "image in JPEG or PNG format" text. This correctly handles both image generation models and TTS models.

Closes #25780

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.astro	@cloudflare/content-engineering, @kodster28

[github-actions]

Preview URL: https://261836d6.preview.developers.cloudflare.com
Preview Branch URL: https://opencode-issue25780-20260206110758.preview.developers.cloudflare.com

[elithrar]

/bonk fix the syntax issues

11:11:03 [check] Getting diagnostics for Astro files in /home/runner/work/cloudflare-docs/cloudflare-docs...
vitest.workspace.ts:7:19 - warning ts(6387): The signature '(config: TestProjectConfiguration[]): TestProjectConfiguration[]' of 'defineWorkspace' is deprecated.

7 const workspace = defineWorkspace([
                    ~~~~~~~~~~~~~~~
vitest.workspace.ts:1:10 - warning ts(6385): 'defineWorkspace' is deprecated.

1 import { defineWorkspace, defineProject } from "vitest/config";
           ~~~~~~~~~~~~~~~

src/components/OneTrust.astro:20:11 - warning ts(6133): 'OptanonWrapper' is declared but its value is never read.

20  function OptanonWrapper() {}
             ~~~~~~~~~~~~~~

src/pages/workers-ai/models/[name].astro:305:110 - error ts(2339): Property 'replace' does not exist on type '{}'.

305       <>The binding returns a <code>ReadableStream</code> with the audio in {model.schema.output.contentType.replace("audio/", "").toUpperCase()} format (check the model's output schema).</>
                                                                                                                 ~~~~~~~
src/pages/workers-ai/models/[name].astro:304:40 - error ts(2339): Property 'startsWith' does not exist on type '{}'.

304      {model.schema.output.contentType?.startsWith("audio/") ? (
                                           ~~~~~~~~~~

Result (285 files): 
- 2 errors
- 0 warnings
- 3 hints

Error: Process completed with exit code 1.

[ask-bonk]

The two type errors are fixed by adding as string casts to model.schema.output.contentType at src/pages/workers-ai/models/[name].astro:304-305. The property's type definition is {} but it holds string values like "audio/mpeg" at runtime, so the cast is needed for .startsWith() and .replace() to compile.

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