fix: add .trycloudflare.com to allowedHosts when tunnel enabled

[Copilot]

Vite 6.0.9+ blocks Cloudflare Quick Tunnel requests by default. When users run slidev --remote --tunnel, the tunnel URL is rejected with "Blocked request. This host is not allowed."

Changes

Modified packages/slidev/node/cli.ts to automatically add .trycloudflare.com to Vite's server.allowedHosts when both --tunnel and --remote flags are present:

server: {
  port,
  strictPort: true,
  open,
  host,
  force,
  // Allow Cloudflare Quick Tunnel domains when tunneling is enabled
  ...(tunnel && remote != null ? { allowedHosts: ['.trycloudflare.com'] } : {}),
}

The configuration only applies when tunneling is active (matching the condition at lines 203-206) and merges with any user-provided allowedHosts in their vite.config.ts.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• download.cypress.io
  • Triggering command: node index.js --exec install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>server.allowedHosts</issue_title>
<issue_description>docker部署之后不能用域名进行访问
Blocked request. This host ("xxx.dkln.cn") is not allowed.
To allow this host, add "xxx.dkln.cn" to server.allowedHosts in vite.config.js.</issue_description>

<agent_instructions>When tunneling via cloudflare (e.g. --tunnel), add .trycloudflare.com to Vite's allowedHosts configuration automatically.</agent_instructions>

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

@kermanx > This issue is not only valid for `slidev-theme-neversink` but also affects other themes like `@slidev/theme-seriph`. The breaking change was introduced in [Vite 6.0.9](https://github.com/vitejs/vite/blob/v6.0.9/packages/vite/CHANGELOG.md?rgh-link-date=2025-06-15T17%3A26%3A57.000Z). As a temporary workaround, you can downgrade Slidev to version 51.0.2 and Vite to 6.0.8.

In fact, you can just create a vite.config.ts besides your slides.md, and add the erver.allowedHosts configuration. The vite configs are expected to be merged.</comment_new>

• Fixes server.allowedHosts #2144

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