feat: WebUI for XMOJ short messages (messages.html) + CORS proxy + userscript integration

[Copilot]

iOS/iPadOS users cannot install userscripts, making XMOJ short messages inaccessible. This adds a standalone messages.html web page with full send/receive/image support, wired into the existing userscript for seamless session hand-off.

New: messages.html

• Split-pane layout (sidebar inbox list + thread view); mobile-slide animation
• Login via userscript auto-fill (primary), manual PHPSESSID entry (fallback)
• Send messages with image upload (paste or file picker); images served from api.xmoj-bbs.me
• 10 s thread auto-refresh, 30 s background list refresh
• Client-side rate-limit: max 5 sends / 60 s
• Alpha badge; linked from index.html navbar and feature list

New: functions/api-proxy/[[path]].js

Cloudflare Pages Function that proxies all API POST requests server-side to api.xmoj-bbs.me, bypassing browser CORS restrictions. SSRF-guarded to only forward to the allow-listed upstream.

browser → /api-proxy/<endpoint> (same-origin) → api.xmoj-bbs.me/<endpoint>

API_BASE in messages.html is a relative /api-proxy/ path, so it works on any deployment domain without configuration.

XMOJ.user.js changes

• Adds @match for xmoj-bbs.me/messages.html; on that domain the script exits after injecting the auto-fill only (no other features run)
• Auto-fill: reads PHPSESSID via GM.cookie.list() (handles HttpOnly cookies) and fires xmoj-autofill-session on the page; toasts the user to log in if no session is found
• Guards the #profile === null → loginpage.php redirect behind a hostname check so xmoj-bbs.me is never redirected
• Fixes UtilityEnabled catch block infinite recursion (was calling itself; now returns false)
• Replaces 4 stale assets.xmoj-bbs.me image URLs with api.xmoj-bbs.me
• Adds missing semicolon on ServerURL declaration

Bug fixes

Bug	Fix
参数DebugMode未找到 backend error	Added DebugMode: false to every messages.html API POST body
UtilityEnabled stack overflow when localStorage unavailable	Catch block now returns false instead of recursing
Redirect to loginpage.php on xmoj-bbs.me	location.replace now gated on hostname check
Image CDN domain mismatch	assets.xmoj-bbs.me → api.xmoj-bbs.me throughout

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature Request] WebUI for short message viewing</issue_title>
<issue_description>### 检查项

• 我已确认了XMOJ增强脚本已为最新版，且最新版未实现这一功能。
• 我已在 Issues 页面 中搜索，确认了这一提案未被提交过。

描述

Support viewing short messages without installing the userscript.

原因

Because you can't install this userscript on iOS/iPadOS</issue_description>

<agent_instructions>做一个网页，让用户输入在xmoj.tech上的账户和密码，我们去获取用户phpsessid，参照现有的script脚本从api拉取短消息并支持发送/收取/发送图片等。同时兼顾实用性和安全性和可维护性</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@boomzero ...... @PythonSmall-Q 一些问题：怎么登陆（我想到的只有用户输入PHPSESSID），系统校验 @PythonSmall-Q 但是不是所有人都知道怎么搞PHPSESSID @boomzero Maybe we just ask for the password… @boomzero And get the phpsessid ourselves @boomzero It’s actually easy because we could just copy quicksubmit’s login code @boomzero 6

• Fixes [Feature Request] WebUI for short message viewing #752

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Summary by cubic

Add a web UI to read and send XMOJ short messages without the userscript, with bookmarklet/manual PHPSESSID login, image uploads, and a split‑pane chat interface; works on iOS/iPadOS. Linked from index.html with an Alpha badge and integrates with the userscript for auto-login.

• New Features

  • Split‑pane inbox/thread/compose with Markdown, image paste/upload, click‑to‑view, and auto‑refresh; mobile slide‑back navigation.
  • Login via bookmarklet or manual PHPSESSID; no password storage. All API calls go through a same‑origin Cloudflare Pages CORS proxy (/api-proxy/) with SSRF guard and allow‑listed headers.
  • Client‑side send rate limit (5/60s) and loading/disabled states on send/login.
  • Userscript integration: auto‑fill via xmoj-autofill-session/xmoj-show-toast; userscript only scopes messages.html.

• Bug Fixes

  • API: include DebugMode: false in POST (fixes “参数DebugMode未找到”); image URLs now use https://api.xmoj-bbs.me.
  • Userscript: prevent login redirect on xmoj-bbs.me/messages.html; read PHPSESSID from both www.xmoj.tech and 116.62.212.172; fix UtilityEnabled recursion; add missing semicolon.

^{Written for commit f9a8762. Summary will update on new commits.}

[cloudflare-workers-and-pages]

Deploying xmoj-script-dev-channel with    Cloudflare Pages

Latest commit:	f9a8762
Status:	✅  Deploy successful!
Preview URL:	https://4c8622ae.xmoj-script-dev-channel.pages.dev
Branch Preview URL:	https://copilot-feature-webui-short.xmoj-script-dev-channel.pages.dev

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