Summary

## Feature Description

Add support for configuring a proxy for WhatsApp connections, similar to the existing proxy support for Telegram.

## Use Case

Users in regions where WhatsApp is blocked (e.g., China mainland) need to use a proxy to connect to WhatsApp Web. Currently, Telegram already supports proxy configuration via `channels.telegram.proxy`, but WhatsApp does not have this option.

## Proposed Solution

Add a `proxy` configuration option to `WhatsAppConfig` in `src/config/types.whatsapp.ts`, similar to how it's implemented for Telegram:

```typescript
// In WhatsAppConfig:
proxy?: string;

Then pass this proxy to the Baileys makeWASocket function in src/web/session.ts:

import { ProxyAgent } from "undici";

const sock = makeWASocket({
  // ... existing options
  fetchAgent: new ProxyAgent(proxyUrl),
});

Why This Works

• The @whiskeysockets/baileys library supports proxy via the fetchAgent option
• Telegram already has a working proxy implementation in src/telegram/proxy.ts using undici's ProxyAgent
• This approach is consistent with the existing Telegram proxy feature

Additional Context

• Telegram proxy config: channels.telegram.proxy
• Telegram proxy implementation: src/telegram/monitor.ts (line ~120)
• Baileys documentation: https://github.com/WhiskeySockets/Baileys#using-a-proxy

### Problem to solve

## Why This Works

- The `@whiskeysockets/baileys` library supports proxy via the `fetchAgent` option
- Telegram already has a working proxy implementation in `src/telegram/proxy.ts` using `undici`'s `ProxyAgent`
- This approach is consistent with the existing Telegram proxy feature

## Additional Context

- Telegram proxy config: `channels.telegram.proxy`
- Telegram proxy implementation: `src/telegram/monitor.ts` (line ~120)
- Baileys documentation: https://github.com/WhiskeySockets/Baileys#using-a-proxy

### Proposed solution

## Proposed Solution

Add a `proxy` configuration option to `WhatsAppConfig` in `src/config/types.whatsapp.ts`, similar to how it's implemented for Telegram:

```typescript
// In WhatsAppConfig:
proxy?: string;

Then pass this proxy to the Baileys makeWASocket function in src/web/session.ts:

import { ProxyAgent } from "undici";

const sock = makeWASocket({
  // ... existing options
  fetchAgent: new ProxyAgent(proxyUrl),
});

Alternatives considered

No response

Impact

Additional Context

• Telegram proxy config: channels.telegram.proxy
• Telegram proxy implementation: src/telegram/monitor.ts (line ~120)
• Baileys documentation: https://github.com/WhiskeySockets/Baileys#using-a-proxy

Evidence/examples

No response

Additional information

No response