feat: complete Zhizi cloud remote compute flow

[wimi321]

Summary

Completes the first-productized Zhizi cloud remote compute flow for GoAgent.

• Keeps local KataGo as the default path and makes Zhizi cloud explicit opt-in.
• Adds Zhizi account status inspection, refresh/test connection IPC, logout cleanup, and official App download link.
• Builds official Socket.IO/GTP args from simple compute tiers: standard, fast, deep.
• Adds Settings UI for login, account check, connection test, remote session refresh, enable/disable remote analysis, and advanced overrides.
• Persists clear Zhizi status values: logged-out, logged-in, ready, no-credit, token-expired, network-error, worker-unavailable.
• Updates Zhizi documentation and contract tests.

Verification

• git diff --check
• pnpm check
• pnpm check:teacher-quality

Notes

No public payment API or embeddable recharge API was available in the open docs. When credit is insufficient, GoAgent now directs users to the official Zhizi app download page, so they can recharge or activate compute inside the official app: https://zhizigo.com/download.

[wimi321]

感谢这份 PR 对智子云完整流程的推进。经过逐项审查，当前 main 中 PR #27 已采用更完整的持久 Socket.IO/GTP 引擎，包含真实连接探测、会话复用、取消、重试、VIP 共享与独享档位，并保持本机分析为默认。

本 PR 中仍有价值且 main 尚缺的“智子官方 App 下载/充值指引”已通过 PR #28 迁移并完成三平台 CI。直接合并 #14 会恢复旧的短连接实现，并在登录后自动启用远程算力，造成行为回退，因此不再合并原分支。感谢这项工作的设计输入和实现基础。