Add GeeTest v3 support (v1.1.0)

[capskip]

Adds GeeTest v3 (slide) solving to the Node SDK, matching the GeeTest v3 API docs.

What's new

const result = await solver.geetest(
  '81388ea1fc187e0c335c0a8907ff2625',
  '7cf6a8b1a2c34d5e6f7089abcdef0123',
  'https://example.com/login',
);

result.challenge;   // geetest_challenge
result.validate;    // geetest_validate
result.seccode;     // geetest_seccode

Available on CapSkip and the AsyncCapSkip alias, with TypeScript definitions.

Design notes

• code keeps the raw JSON string CapSkip returns, so code ported from another solver's API still works. The parsed fields are added alongside it — unlike every other captcha type, code alone is not directly usable for GeeTest. An unparseable payload is passed through untouched rather than masked.
• Submit params are limited to the documented set — gt, challenge, pageurl, api_server, json, proxy, proxytype. All three required fields are checked locally, so a missing value fails before the round-trip instead of returning ERROR_BAD_PARAMETERS / ERROR_PAGEURL.
• Uses the longer recaptchaTimeout budget rather than defaultTimeout, since GeeTest is a real browser solve with internal retries. A caller-supplied timeout still wins. No new constructor option was added.
• apiServer / api_subdomain are accepted as aliases for api_server.

Also included

proxytype is now validated against the values CapSkip actually maps — HTTP, HTTPS, SOCKS5, SOCKS5H, case-insensitive — for every proxy-capable captcha type. SOCKS4 and other values previously reached the server and came back as ERROR_BAD_PARAMETERS; they now raise ValidationException locally. Image captcha is excluded so it keeps its clearer "proxy is not supported" message.

This touches reCAPTCHA and Turnstile as well as GeeTest, since they share the same submit path.

The README intro also drops its "no cloud service" phrasing; the sentence still makes the local / no-per-solve-fee point.

Testing

• 71 unit tests pass (up from 57), covering the submit payload, api_server and its aliases, proxy handling, solution-field expansion, non-JSON payloads, the required-field checks, and every accepted/rejected proxy type.
• Verified end-to-end against a live CapSkip instance — 31/31 checks, run against the packed npm tarball installed into a clean project, not the source tree. That also confirms src/ and types/ ship correctly under the files allowlist. 5/5 GeeTest solves, averaging 13.4s.
• Image captcha, reCAPTCHA v2 and Turnstile all still solve, and the new fields never leak into their results. Reusing a burned challenge surfaces a clear ApiException rather than hanging.

Docs

README, tutorial (new section 8), API reference, getting started, troubleshooting, and changelog all updated. Version bumped to 1.1.0 in both package.json and src/index.js; geetest added to the keywords.

Note

The server also supports GeeTest v4 (method=geetest_v4, captcha_id), which this PR does not add.