feat: update About panel (system stats and version info) to work on cloud (#6940)

## Summary

Updates the About Panel in the settings to work with the cloud-specific
`GET /system_stats` response schema.

| Before | After |
| ------ | ----- |
| <img width="1922" height="1436" alt="Selection_2392"
src="https://github.com/user-attachments/assets/3b97bf38-7eeb-4f46-9c59-eb681f5d7401"
/> | <img width="1922" height="1436" alt="Selection_2391"
src="https://github.com/user-attachments/assets/1d30e604-654a-4d48-ba05-4cac3b54c2ba"
/> |

## Screenshots (if applicable)

OSS version stays the same:

<img width="1922" height="1436" alt="Selection_2393"
src="https://github.com/user-attachments/assets/40e1eeeb-fc5a-4ad0-b37f-dc5d0374901e"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6940-feat-update-About-panel-system-stats-and-version-info-to-work-on-cloud-2b66d73d365081f69b6fedfe9507ba92)
by [Unito](https://www.unito.io)

src/schemas/apiSchema.ts

@@ -334,7 +334,11 @@ const zSystemStats = z.object({
     required_frontend_version: z.string().optional(),
     argv: z.array(z.string()),
     ram_total: z.number(),
-    ram_free: z.number()
+    ram_free: z.number(),
+    // Cloud-specific fields
+    cloud_version: z.string().optional(),
+    comfyui_frontend_version: z.string().optional(),
+    workflow_templates_version: z.string().optional()
   }),
   devices: z.array(zDeviceStats)
 })