[BUG]: wallet_addEthereumChain throws error: Error JSON PRC response: the method wallet_addEthereumChain does not exist/is not available

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- [x] I checked to make sure that this issue has not already been filed
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**Describe the bug**

`wallet_addEthereumChain` does not seem to work any more.

Example code:

```js
window.ethereum.request({
method: 'wallet_addEthereumChain',
params: [{
chainId: '0x64',
chainName: 'Gnosis Chain',
nativeCurrency: {
name: 'xDAI',
symbol: 'xDAI',
decimals: 18
},
rpcUrls: ['https://rpc.gnosischain.com/'],
blockExplorerUrls: ['https://gnosisscan.io/']
}]
});
```

Error:

```
{
"name": "Error",
"message": "Error JSON PRC response: the method wallet_addEthereumChain does not exist/is not available",
"stack": "Error: Error JSON PRC response: the method wallet_addEthereumChain does not exist/is not available\n at parseRPCResponse (chrome-extension://jnmbobjmhlngoefaiojfljckilhhlhcj/background.bundle.js:8:3585179)\n at chrome-extension://jnmbobjmhlngoefaiojfljckilhhlhcj/background.bundle.js:8:1453930\n at Array.map ()\n at ServiceDApp. (chrome-extension://jnmbobjmhlngoefaiojfljckilhhlhcj/background.bundle.js:8:1453890)\n at Generator.next ()\n at asyncGeneratorStep (chrome-extension://jnmbobjmhlngoefaiojfljckilhhlhcj/background.bundle.js:8:11373261)\n at _next (chrome-extension://jnmbobjmhlngoefaiojfljckilhhlhcj/background.bundle.js:8:11373506)"
}
```

**To Reproduce**
Go to console and execute the above code or [the sample code in your repo](https://github.com/OneKeyHQ/test-dapp/blob/843c891524b90b9f3ce777cf3c948760b5090747/src/index.js#L287-L298).

**Expected behavior**
This will prompt the "Add chain to wallet" window to appear.

**Screenshots**
The video below demonstrates me: 1) successfully using the same code to bring up Rainbow Wallet; 2) attempting to use the same code but failing to bring up OneKey Wallet.

https://github.com/user-attachments/assets/8f571764-bc6b-4dbb-b53a-9c7530f551c9

**Desktop (please complete the following information):**
- OS: macOS
- Browser: arc
- Version: latest

**Additional context**
I have just tested the Chrome extension. Some users are reporting that they are unable to do the same in the app too.

---

edit: I was trying to make a PR to fix this but found [this endpoint](https://github.com/OneKeyHQ/app-monorepo/blob/a95239e597e2fffeb4dc342e1384b6ba568ead41/packages/kit-bg/src/services/ServiceDApp.ts#L936) is not open source? Btw, you should definitely fix the disturbing `PRC` typo.