Add Web Bot Auth and proxy routes session options

[NikhilShahi]

• web_bot_auth (True, or {"only_domains": [...]}) signs the session's requests with Web Bot Auth. It works for sessions and agent tasks; SessionLaunchState.web_bot_auth reports how a session signs.
• proxy_routes chooses, per host, whether traffic goes through the session's proxy ("default") or straight out ("direct"). It only applies when creating a session.
• Both are in the request TypedDicts and the legacy Pydantic models. The new nested models reject unknown keys, so a misspelled "onlyDomains" fails instead of being dropped and signing for every host.
• Runtime tests for both clients, mypy and Pyright fixtures, and README sections.

Summary

Changes

Validation

• ruff check
• pytest

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Note

Medium Risk
Web Bot Auth changes request signing scope; strict validation mitigates misconfiguration, but incorrect client usage could still affect which hosts get signed or how traffic is routed.

Overview
Adds Web Bot Auth and proxy routes as session-creation options in the Python SDK, with README docs and typing/tests.

Web Bot Auth: web_bot_auth on CreateSessionParams (and agent session_options) accepts True/False or {"only_domains": [...]}; responses can expose signing details via SessionLaunchState.web_bot_auth (signature_agent, optional only_domains). Pydantic WebBotAuthParams uses extra="forbid" so camelCase typos like onlyDomains fail locally instead of being stripped and widening signing scope.

Proxy routes: proxy_routes (with use_proxy) sends matched hosts through "default" (session proxy) or "direct"; patterns support hostnames, *.example.com, or *, with first-match wins.

Exports cover both hyperbrowser.types TypedDicts and hyperbrowser.models Pydantic types. New wire-contract tests (sync/async), launch-state parsing tests, and mypy/Pyright valid/invalid fixtures document constraints (e.g. incompatibilities with ultra-stealth / snapshot / allow_out noted in field docs).

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