fix: add PySocks as direct dependency

The network module (request_url.py) imports socks directly for
SOCKS proxy support.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: EstrellaXD

backend/pyproject.toml

@@ -25,6 +25,7 @@ dependencies = [
     "webauthn>=2.0.0",
     "urllib3>=2.0.3",
     "requests>=2.31.0",
+    "PySocks>=1.7.1",
 ]
 
 [dependency-groups]