Add guest login branch, smarter Doudizhu bot logic, and responsive Guandan layout tweaks

[TypeThe0ry]

Motivation

• Allow ordinary players to enter as guests via a URL branch without forcing Discuz SSO while preserving the Discuz login path.
• Improve automated bot behavior in Doudizhu so bots make smarter call-score decisions and can play all cards when the rules allow.
• Fix layout and responsiveness for Guandan player/top UI and small styling adjustments to improve mobile/centered presentation.

Description

• Expose guest login mode via URL param by adding authMode and initializing guestMode from getURLParam('auth'), and make auto-login token lookup conditional on authMode in static/index.html and the client bootstrap.
• Update login UI conditionals so Discuz auto-login and buttons are shown only when authMode === 'discuz' and show guest input when authMode === 'guest'.
• Add evaluateDoudizhuHand and shouldCallDoudizhuScore helper functions in server.js and use them in botCallScore to derive call decisions from the bot's hand, reducing purely random calls.
• Improve botPlayCard to detect an immediate allOut via game.validate(posId, handRaw) and play the whole hand when valid, while keeping the existing AISuggest fallback and defensive validation.
• Update config.example.json with login mode guidance (_LOGIN_MODES) and minor formatting, and add a README line mentioning the guest login entry.
• Change viewport meta in static/index.html and apply multiple CSS adjustments in static/css/style.css to center and scale .room-guandan .player-top, add .guandan-teams layout, reposition .team-tag, and tweak mobile transform/scale values for better centering and z-index.

Testing

• No automated tests were added or executed for these changes.

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Codex Task

[TypeThe0ry]

@codex[agent] Code review

[Codex]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

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• registry.npm.taobao.org
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• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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