HVNC C2 Server v0.7

Endpoints:

• POST /api/beacon - Client check-in (returns pending commands)
• POST /api/upload - Data upload (screenshots)
• POST /api/result - Command execution result
• GET /api/sessions - List active sessions
• GET /api/results - Last 50 command results
• POST /api/command - Push command (session_id, type, arg)

Redis: Not available (in-memory)