Add stable-audio-3 library (#2190)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> Low risk: adds a new static entry to the model libraries registry
without altering existing logic or data flows.
> 
> **Overview**
> Adds a new `stable-audio-3` entry to `MODEL_LIBRARIES_UI_ELEMENTS` in
`model-libraries.ts`, including label/repo metadata and an Elastic
download-count query targeting `model_config.json` (not included in
filters).
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ca5626f. Bugbot is set up for automated
code reviews on this repo. Configure
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<!-- /CURSOR_SUMMARY -->

Author: mhrice

packages/tasks/src/model-libraries.ts

@@ -1303,6 +1303,13 @@ export const MODEL_LIBRARIES_UI_ELEMENTS = {
 		filter: false,
 		countDownloads: `path_extension:".pth"`,
 	},
+	"stable-audio-3": {
+		prettyLabel: "Stable Audio 3",
+		repoName: "stable-audio-3",
+		repoUrl: "https://github.com/Stability-AI/stable-audio-3",
+		filter: false,
+		countDownloads: `path:"model_config.json"`,
+	},
 	"stable-audio-tools": {
 		prettyLabel: "Stable Audio Tools",
 		repoName: "stable-audio-tools",