Task: Create Admin Dashboard for server metrics and paste management

[tristanbudd]

Description:
Build a secure administrative dashboard panel to monitor active pastes, database storage limits, server memory/CPU usage, and handle moderation tasks.

Tasks:

• Set up secure admin authentication (e.g., admin token config or simple login).
• Implement dashboard API endpoints to retrieve server metrics, active paste counts, and storage usage.
• Design a minimalist admin UI dashboard.
• Add capability to delete pastes or manually trigger expired paste cleanups.