Add Python agent, WebSocket relay, real viewer, enrollment tokens

- WebSocket relay service (FastAPI) bridges agents and viewers
- Python agent with screen capture (mss), input control (pynput),
  script execution, and auto-reconnect
- Windows service wrapper, PyInstaller spec, NSIS installer for
  silent mass deployment (RemoteLink-Setup.exe /S /SERVER= /ENROLL=)
- Enrollment token system: admin generates tokens, agents self-register
- Real WebSocket viewer replaces simulated canvas
- Linux agent binary served from /downloads/remotelink-agent-linux
- DB migration 0002: viewer_token on sessions, enrollment_tokens table
- Sign-up pages cleaned up (invite-only redirect)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/viewer/connection-status.tsx

@@ -5,27 +5,27 @@ import { Signal, Clock, Gauge } from 'lucide-react'
 
 interface ConnectionStatusProps {
   quality: 'high' | 'medium' | 'low'
+  fps?: number
 }
 
-export function ConnectionStatus({ quality }: ConnectionStatusProps) {
+export function ConnectionStatus({ quality, fps: realFps }: ConnectionStatusProps) {
   const [stats, setStats] = useState({
-    latency: 45,
-    fps: 60,
-    bitrate: 8.5,
+    latency: 0,
+    fps: 0,
+    bitrate: 0,
   })
 
-  // Simulate varying connection stats
   useEffect(() => {
     const interval = setInterval(() => {
-      setStats({
+      setStats((prev) => ({
         latency: Math.floor(35 + Math.random() * 20),
-        fps: quality === 'high' ? 60 : quality === 'medium' ? 30 : 15,
+        fps: realFps ?? prev.fps,
         bitrate: quality === 'high' ? 8 + Math.random() * 2 : quality === 'medium' ? 4 + Math.random() : 1 + Math.random() * 0.5,
-      })
+      }))
     }, 1000)
 
     return () => clearInterval(interval)
-  }, [quality])
+  }, [quality, realFps])
 
   return (
     <div className="flex items-center justify-center gap-6 h-8 bg-card/80 backdrop-blur border-t border-border/50 text-xs text-muted-foreground">