fix(cliproxy): respect http_proxy env vars for binary downloads

CLIProxyAPI installation and updates now respect http_proxy, https_proxy,
and all_proxy environment variables when making network requests.

Uses https-proxy-agent and http-proxy-agent packages to route HTTP/HTTPS
requests through the configured proxy server.

Closes #266

package.json

@@ -93,6 +93,8 @@
     "express-session": "^1.18.2",
     "get-port": "^5.1.1",
     "gradient-string": "^2.0.2",
+    "http-proxy-agent": "^7.0.2",
+    "https-proxy-agent": "^7.0.6",
     "js-yaml": "^4.1.1",
     "listr2": "^3.14.0",
     "open": "^8.4.2",