CLI upload calls nonexistent generateUploadUrls function

## Bug

The CLI upload command (`npx @convex-dev/static-hosting upload`) fails because it calls `staticHosting:generateUploadUrls` (plural), but the component only exposes `generateUploadUrl` (singular).

**Version:** 0.1.3

**Error:**
```
Could not find function for 'staticHosting:generateUploadUrls'. Did you forget to run `npx convex dev`?

Available functions:
• staticHosting:generateUploadUrl
• staticHosting:recordAsset
• staticHosting:gcOldAssets
• staticHosting:listAssets
• staticHosting:getCurrentDeployment
```

**Source:** `dist/cli/upload.js` line 175:
```js
const urlsOutput = await convexRunAsync(`${componentName}:generateUploadUrls`, { count: storageFiles.length });
```

The component's `lib.js` only defines `generateUploadUrl` (singular, no `count` parameter). The CLI expects a batch function that doesn't exist.

**Workaround:** Call `generateUploadUrl` individually per file via a custom upload script.