Pass effective proxy to XClIdGen

[kn1l]

Summary

Pass the effective account proxy to the XClIdGen asset client.

Previously, GraphQL requests could use the configured account/API proxy, but XClIdGen.create() created a separate HTTP client without
proxy settings. That client fetches x.com and abs.twimg.com assets before the GraphQL request is sent, so requests could fail in
environments where direct access to those hosts is blocked or unstable even when the account proxy works.

This change:

• adds Account.resolve_proxy() to reuse the same proxy resolution order as Account.make_client()
• passes the resolved proxy into XClIdGen.create()
• includes proxy in the XClIdGenStore cache key to avoid reusing generators across different proxy contexts

Tests

• uv run pytest
• uv run ruff check .
• uv run ty check

[vladkens]

Thanks, this is a great improvement! Congrats on your first contribution to twscrape 🎉