[feature/satellite] OMM data download, server background driven update, optional Space-Track

[MichaelWheeley]

What does this PR do?

• obsolete satellite TLE download replaced with OMM throughout stack
• OMM download for groups using CSV for optimum efficiency, or JSON for individual downloads
• data download no longer event driven but rather happens in background on server using protected state-machine
• improved detection and lockout of CelesTrak 403, touchwood no more getting kicked off their server
• add Space-Track as optional OMM source, controlled from .env - requires login and cookie support
• add ability to disable CelesTrak as source, .env.example modified with details
  • possible to disable both sources if satellite data not wanted at all
• AMSAT and SatNOGS dropped as providers, not OMM providers and data questionable
• add list of satellites whose data sets are known but which are discarded, see /api/satellites/debug
• end point change /api/satellites/data (was /api/satellites/tle)
• kill React warning in debug log for useSatelliteLayer wheel = { passive: true }

Type of change

• Bug fix
• New feature
• Performance improvement
• Refactor / code cleanup
• Documentation
• Translation
• Map layer plugin

How to test

1. see the .env.example on how to enable / disable CelesTrak, and Space-Track with a username/password
2. LOG_LEVEL=debug for additional messaging
3. /api/satellites/data and /api/satellites/debug for status

Checklist

• App loads without console errors
• Tested in Dark, Light, and Retro themes
• Responsive at different screen sizes (desktop + mobile)
• If touching server.js: caches have TTLs and size caps (we serve 2,000+ concurrent users)
• If adding an API route: includes caching and error handling
• If adding a panel: wired into Modern, Classic, and Dockable layouts
• No hardcoded colors — uses CSS variables (var(--accent-cyan), etc.)
• No .bak, .old, console.log debug lines, or test scripts included