docs: add proxy configuration security note to access controls

[e1024x]

Adds a caution block to the access controls page noting that per-app ACLs depend on the reverse proxy correctly setting X-Forwarded-Host. If the proxy passes through client-supplied values or tinyauth is directly reachable, users can spoof the header to a non-matching domain and bypass app-level restrictions.

The note covers what to check for Traefik, Caddy, and nginx, and recommends keeping tinyauth off the public network.

Summary by CodeRabbit

• Documentation
  • Updated access controls guide with security best practices for reverse proxy configuration, including guidance on X-Forwarded-Host trust and preventing spoofing attacks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 91746adb-79ba-4c9c-bc1f-6b13a32ab4e0

📥 Commits

Reviewing files that changed from the base of the PR and between 985ec45 and 6d5fd86.

📒 Files selected for processing (1)

• src/content/docs/docs/guides/access-controls.mdx

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📝 Walkthrough

Walkthrough

Documentation update to the access controls guide adding a caution block about X-Forwarded-Host proxy trust considerations and reverse proxy configuration guidance (nginx) to prevent spoofing, with emphasis that tinyauth should not be directly reachable.

Changes

Cohort / File(s)	Summary
Documentation Update src/content/docs/docs/guides/access-controls.mdx	Added caution block regarding proxy trust considerations for X-Forwarded-Host, reverse proxy configuration (nginx), and security guidance that tinyauth should not be directly reachable.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A cautious note in docs we share,
Of proxies trusted with utmost care,
X-Forwarded-Host gets its due mention,
Nginx guards with noble intention,
Keep tinyauth tucked away,
Safe behind walls, come what may! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely summarizes the main change: adding a security-focused documentation note about proxy configuration to the access controls guide.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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