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>

app/(dashboard)/download/page.tsx

@@ -1,14 +1,7 @@
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
 import { Button } from '@/components/ui/button'
-import { 
-  Download, 
-  Monitor, 
-  Apple, 
-  Terminal,
-  Shield,
-  Cpu,
-  HardDrive
-} from 'lucide-react'
+import { Download, Monitor, Apple, Terminal, Shield, Cpu, HardDrive, Clock } from 'lucide-react'
+import Link from 'next/link'
 
 const platforms = [
   {
@@ -16,43 +9,35 @@ const platforms = [
     icon: Monitor,
     description: 'Windows 10/11 (64-bit)',
     filename: 'RemoteLink-Setup.exe',
-    size: '45 MB',
-    available: true,
+    downloadPath: null,
+    available: false,
+    note: 'Coming soon — build on Windows with PyInstaller + NSIS',
   },
   {
     name: 'macOS',
     icon: Apple,
     description: 'macOS 11+ (Apple Silicon & Intel)',
-    filename: 'RemoteLink.dmg',
-    size: '52 MB',
-    available: true,
+    filename: 'remotelink-agent-macos',
+    downloadPath: null,
+    available: false,
+    note: 'Coming soon — build on macOS with PyInstaller',
   },
   {
     name: 'Linux',
     icon: Terminal,
-    description: 'Ubuntu, Debian, Fedora, Arch',
-    filename: 'remotelink-agent.AppImage',
-    size: '48 MB',
+    description: 'x86_64 — Ubuntu, Debian, Fedora, Arch',
+    filename: 'remotelink-agent-linux',
+    downloadPath: '/downloads/remotelink-agent-linux',
     available: true,
+    size: '19 MB',
+    note: null,
   },
 ]
 
 const features = [
-  {
-    icon: Shield,
-    title: 'Secure',
-    description: 'End-to-end encryption for all connections',
-  },
-  {
-    icon: Cpu,
-    title: 'Lightweight',
-    description: 'Minimal system resource usage',
-  },
-  {
-    icon: HardDrive,
-    title: 'Portable',
-    description: 'No installation required on Windows',
-  },
+  { icon: Shield, title: 'Secure', description: 'All traffic routed through your own relay server' },
+  { icon: Cpu, title: 'Lightweight', description: 'Single binary, minimal CPU and memory usage' },
+  { icon: HardDrive, title: 'Portable', description: 'Run once with no install, or deploy as a service' },
 ]
 
 export default function DownloadPage() {
@@ -61,17 +46,17 @@ export default function DownloadPage() {
       <div className="text-center">
         <h2 className="text-2xl font-bold mb-2">Download RemoteLink Agent</h2>
         <p className="text-muted-foreground max-w-xl mx-auto text-balance">
-          Install the agent on machines you want to control remotely. 
-          The agent runs in the background and enables secure connections.
+          Install the agent on machines you want to control remotely.
+          It connects back to your server and waits for a viewer session.
         </p>
       </div>
 
       <div className="grid gap-4 md:grid-cols-3">
         {platforms.map((platform) => (
-          <Card key={platform.name} className="border-border/50">
+          <Card key={platform.name} className={`border-border/50 ${!platform.available ? 'opacity-60' : ''}`}>
             <CardHeader className="text-center pb-2">
-              <div className="mx-auto mb-3 flex h-14 w-14 items-center justify-center rounded-xl bg-primary/10">
-                <platform.icon className="h-7 w-7 text-primary" />
+              <div className={`mx-auto mb-3 flex h-14 w-14 items-center justify-center rounded-xl ${platform.available ? 'bg-primary/10' : 'bg-muted'}`}>
+                <platform.icon className={`h-7 w-7 ${platform.available ? 'text-primary' : 'text-muted-foreground'}`} />
               </div>
               <CardTitle>{platform.name}</CardTitle>
               <CardDescription>{platform.description}</CardDescription>
@@ -79,15 +64,26 @@ export default function DownloadPage() {
             <CardContent className="space-y-4">
               <div className="text-center text-sm text-muted-foreground">
                 <p className="font-mono">{platform.filename}</p>
-                <p>{platform.size}</p>
+                {platform.available && 'size' in platform && <p>{platform.size}</p>}
               </div>
-              <Button 
-                className="w-full" 
-                disabled={!platform.available}
-              >
-                <Download className="mr-2 h-4 w-4" />
-                Download
-              </Button>
+
+              {platform.available && platform.downloadPath ? (
+                <Button className="w-full" asChild>
+                  <a href={platform.downloadPath} download={platform.filename}>
+                    <Download className="mr-2 h-4 w-4" />
+                    Download
+                  </a>
+                </Button>
+              ) : (
+                <Button className="w-full" disabled>
+                  <Clock className="mr-2 h-4 w-4" />
+                  Coming soon
+                </Button>
+              )}
+
+              {platform.note && (
+                <p className="text-xs text-muted-foreground text-center">{platform.note}</p>
+              )}
             </CardContent>
           </Card>
         ))}
@@ -118,30 +114,27 @@ export default function DownloadPage() {
         </CardHeader>
         <CardContent className="space-y-6">
           <div>
-            <h4 className="font-medium mb-2">Windows</h4>
+            <h4 className="font-medium mb-2">Linux — run once (portable)</h4>
             <ol className="list-decimal list-inside space-y-1 text-sm text-muted-foreground">
-              <li>Download and run RemoteLink-Setup.exe</li>
-              <li>Follow the installation wizard</li>
-              <li>The agent will start automatically and appear in your system tray</li>
-              <li>Click the tray icon to generate a session code</li>
+              <li>Download <code className="bg-muted px-1 rounded">remotelink-agent-linux</code></li>
+              <li>Make it executable: <code className="bg-muted px-1 rounded">chmod +x remotelink-agent-linux</code></li>
+              <li>Get an enrollment token from <Link href="/dashboard/admin" className="text-primary underline underline-offset-2">Admin → Agent enrollment</Link></li>
+              <li>Run: <code className="bg-muted px-1 rounded">./remotelink-agent-linux --server https://your-server --enroll YOUR_TOKEN --run-once</code></li>
             </ol>
           </div>
           <div>
-            <h4 className="font-medium mb-2">macOS</h4>
+            <h4 className="font-medium mb-2">Linux — permanent install (reconnects on reboot)</h4>
             <ol className="list-decimal list-inside space-y-1 text-sm text-muted-foreground">
-              <li>Download and open RemoteLink.dmg</li>
-              <li>Drag RemoteLink to your Applications folder</li>
-              <li>Open RemoteLink from Applications</li>
-              <li>Grant accessibility permissions when prompted</li>
+              <li>Run without <code className="bg-muted px-1 rounded">--run-once</code> — config is saved to <code className="bg-muted px-1 rounded">/etc/remotelink/agent.json</code></li>
+              <li>Create a systemd service or add to crontab with <code className="bg-muted px-1 rounded">@reboot</code></li>
             </ol>
           </div>
           <div>
-            <h4 className="font-medium mb-2">Linux</h4>
+            <h4 className="font-medium mb-2">Windows — silent mass deploy (coming soon)</h4>
             <ol className="list-decimal list-inside space-y-1 text-sm text-muted-foreground">
-              <li>Download the AppImage file</li>
-              <li>Make it executable: <code className="bg-muted px-1 rounded">chmod +x remotelink-agent.AppImage</code></li>
-              <li>Run the AppImage</li>
-              <li>The agent will appear in your system tray</li>
+              <li>Build <code className="bg-muted px-1 rounded">RemoteLink-Setup.exe</code> on a Windows machine using the NSIS installer script in the agent source</li>
+              <li>Deploy silently: <code className="bg-muted px-1 rounded">RemoteLink-Setup.exe /S /SERVER=https://your-server /ENROLL=YOUR_TOKEN</code></li>
+              <li>The installer registers a Windows Service that auto-starts on boot</li>
             </ol>
           </div>
         </CardContent>