External Browsers Not Supported

Because of the way browser use has different parameters for external browsers, external browsers are not currently supported. Ideally we would love to be able to pass a browser "type" to the config.yaml that would let us define if its local path, cdp, or wss url.To allow blast to support custom proxies, and external browsers.

https://docs.browser-use.com/customize/browser-settings#external-browser-provider-cdp`

blast/blastai/resource_manager.py

Line 275 in e2a48e4

if browser_path:

```
browser_config = BrowserConfig(
        headless=self.constraints.require_headless
    )

    # Handle local browser path if not "none"
    if self.settings.local_browser_path != "none":
        if self.settings.local_browser_path == "auto":
            # Auto-detect browser path
            browser_path = find_local_browser()
            if browser_path:
                browser_config.browser_binary_path = browser_path
                logger.debug(f"Using auto-detected browser at: {browser_path}")
        else:
            # Use specified path directly
            browser_path = self.settings.local_browser_path
            if not os.path.exists(browser_path):
                logger.error(f"Specified local browser path does not exist: {browser_path}")
                return None
            browser_config.browser_binary_path = browser_path