Document centralized permission system from PR 2060

[Copilot]

Documents the role-based access control system introduced in the-open-agent/openagent#2060, which centralized permission checks into util/permission.go.

User documentation

• Added "User Roles & Permissions" section to docs/chats/overview.mdx explaining Regular Users, Chat Admins (chat-admin role), and System Administrators
• Updated docs/messages/overview.mdx to reference the permissions section

Developer documentation

• Added "Permission System Architecture" to docs/developer-guide/swagger.md with usage examples:

// Use centralized permission utilities
if !util.IsAdminOrChatAdmin(user) {
    // Deny access
}

if util.IsChatAdmin(user) {
    // Grant chat admin privileges
}

Emphasizes avoiding hardcoded role strings to maintain the refactoring benefits.

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:

• https://api.github.com/repos/casibase/casibase/pulls/2060
  • Triggering command: /usr/bin/curl curl -s REDACTED (http 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>[docs] add docs for the PR: 2060</issue_title>
<issue_description>Improve the related docs page based on the newly merged PR: the-open-agent/openagent#2060
You should write high-quality human-like docs for a modern OSS software. Don't write in the GPT-flavor. Don't write too long, keep it tidy docs. Don't use itemized list to describe things like "Use Cases", "Best practice" or "what it can do"
don't change yarn.lock
Avoid adding new docs pages, try the best to add content to the suitable existing docs pages
Don't add too long text, keep it short and to the point
Don't add the docs in a template like one section name and one text paragraph. You need to organize the content to be user-friendly and not boring for users to read</issue_description>

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

• Fixes [docs] add docs for the PR: 2060 #116

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[netlify]

✅ Deploy Preview for casibase ready!

Name	Link
🔨 Latest commit	54f3d8e
🔍 Latest deploy log	https://app.netlify.com/projects/casibase/deploys/695767da31b4860008af53a4
😎 Deploy Preview	https://deploy-preview-133--casibase.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[hsluoyz]

replaced by: #115