Add RCON connection status indicator to admin dashboard

[Copilot]

Admin panel lacked visibility into RCON server connectivity, leaving admins uncertain why whitelist approvals might silently fail when the Minecraft server is unreachable.

Changes

Backend

• Added GET /api/status/rcon endpoint that attempts RCON connection and returns status
• Protected with authMiddleware (admin-only access)
• Returns {status, connected, message} payload

Frontend

• Status indicator positioned above user table in Dashboard
• Polls endpoint every 5s (matches existing Home component pattern)
• Visual states:
  • 🟩 Green: "Server is running"
  • 🟥 Red: "Server is offline - Entries cannot be approved"

Implementation Notes

• Connection test uses existing connectRcon()/disconnectRcon() helpers
• Gracefully handles connection failures (returns 200 with connected: false)
• Status check creates ephemeral connection; does not maintain persistent state

Original prompt

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This section details on the original issue you should resolve

<issue_title>Admin Panel - Show Error Message when Server is Offline</issue_title>
<issue_description>Display an error message that the rcon server is not connected and, therefore, no entries can be approved.
Or add an icon somewhere in the adminpannel.

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

• Fixes Admin Panel - Show Error Message when Server is Offline #5

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Project	Deployment	Review	Updated (UTC)
convitelist	Ready	Preview, Comment	Jan 23, 2026 1:17pm