[ChatGPT Coding Setup 3/3] 真实验收接入、打包与端到端界面检查

[NOirBRight]

Part of #596. Blocked by #597 and #598.

Integrate the A wizard's final Verify step with the real tool probe. Align CodexHub Provider card / settings entry copy, bundle required static assets in Linux and Windows, and validate the assembled flow without claiming broader #567/#592 acceptance.

Acceptance:

• First-run, saved-awaiting-restart, expired account, connector restriction and tool failure each lead to the right single next action. Only current real probe pass shows coding setup complete and hands back to CodexHub model/client selection.
• Actual production page and APIs contain no mock values, prototype switcher or simulated completion. Accessible keyboard/mobile flow; no duplicate browser windows from an early global check.
• Run targeted tests, relevant strict local suites and manual browser inspection on the exact PR SHA. Record sanitized evidence and remaining live-account limits.
• PR title/body accurately describes final behavior, references Closes [Spec] ChatGPT Coding Setup 向导：定稿 A 与真实工具验收 #596/[ChatGPT Coding Setup 1/3] 生产 A 向导与真实账号、Tunnel、授权步骤 #597/[ChatGPT Coding Setup 2/3] 真实无副作用工具往返探测 #598, and is ready for review after code-review findings are cleared. [Spec] CodexHub 托管 ChatGPT Web：三客户端与完整 V2 明文生命周期 #567/ChatGPT: authenticate in the daily browser and explicitly connect its session #592 stay open.