feat(vpn): VPN on-demand Tailscale + agent studioE5 standalone

- Agent studioE5 standalone en Go (console + systray)
- VPN on-demand via tailscaled + tailscale up (authkey Headscale)
- Resolver/serveur dans le tailnet studioe5
- Caddy on-demand TLS pour les instances
- Nouveaux endpoints serveur /api/internal/send-to-node
- Suppression des anciens binaires edubox-agent
- Suivi dans SUIVI_VPN_ONDEMAND.md

server/app/(auth)/login/page.tsx

@@ -6,7 +6,7 @@ export default function LoginPage() {
   return (
     <div className="flex min-h-screen items-center justify-center bg-gray-50">
       <div className="w-full max-w-md p-8 space-y-6 bg-white rounded-lg shadow-md">
-        <h1 className="text-2xl font-bold text-center text-gray-900">EduBox V2</h1>
+        <h1 className="text-2xl font-bold text-center text-gray-900">studioE5</h1>
         <p className="text-center text-muted-foreground">Connexion à la plateforme</p>
         <LoginForm />
       </div>

server/app/api/check-domain/route.ts

@@ -11,7 +11,10 @@ export async function GET(req: NextRequest) {
     return NextResponse.json({ ok: false }, { status: 400 });
   }
 
-  if (domain === MAIN_DOMAIN || domain === `headscale.${MAIN_DOMAIN}`) {
+  if (
+    domain === MAIN_DOMAIN ||
+    domain === `headscale.${MAIN_DOMAIN}`
+  ) {
     return NextResponse.json({ ok: true });
   }
 

server/app/api/download/route.ts

@@ -1,12 +1,13 @@
 import { NextResponse } from "next/server";
 
 const AGENT_VERSION = "0.3.0";
+const AGENT_BIN_NAME = "studioE5-agent";
 
 export async function GET() {
   return NextResponse.json({
     version: AGENT_VERSION,
-    windows: `/edubox-agent-v${AGENT_VERSION}.exe`,
-    linux: `/edubox-agent-v${AGENT_VERSION}`,
-    mac: `/edubox-agent-v${AGENT_VERSION}-mac`,
+    windows: `/${AGENT_BIN_NAME}-v${AGENT_VERSION}.exe`,
+    linux: `/${AGENT_BIN_NAME}-v${AGENT_VERSION}`,
+    mac: `/${AGENT_BIN_NAME}-v${AGENT_VERSION}-mac`,
   });
 }

server/app/api/internal/send-to-node/route.ts

@@ -0,0 +1,12 @@
+import { NextRequest, NextResponse } from "next/server";
+import { sendToNode } from "@/lib/websocket";
+
+export async function POST(req: NextRequest) {
+  const body = await req.json();
+  const { nodeId, message } = body;
+  if (!nodeId || !message) {
+    return NextResponse.json({ error: "Missing nodeId or message" }, { status: 400 });
+  }
+  const sent = sendToNode(nodeId, message);
+  return NextResponse.json({ sent });
+}

server/app/dashboard/DashboardNav.tsx

@@ -26,7 +26,7 @@ export default function DashboardNav({ role }: { role: string }) {
   return (
     <nav className="w-64 bg-white border-r flex flex-col">
       <div className="p-6 border-b">
-        <h2 className="text-xl font-bold text-primary">EduBox</h2>
+        <h2 className="text-xl font-bold text-primary">studioE5</h2>
       </div>
       <div className="flex-1 p-4 space-y-1">
         {links.map((link) => (

server/app/dashboard/download/page.tsx

@@ -1,6 +1,7 @@
 import { Card, CardHeader, CardTitle, CardContent } from "@/components/ui/card";
 
 const AGENT_VERSION = "0.3.0";
+const AGENT_BIN_NAME = "studioE5-agent";
 
 export const dynamic = "force-dynamic";
 
@@ -15,8 +16,8 @@ export default function DownloadPage() {
             <CardTitle>Windows</CardTitle>
           </CardHeader>
           <CardContent>
-            <p className="text-sm text-muted-foreground mb-4">Agent EduBox pour Windows (64 bits)</p>
-            <a href={`/edubox-agent-v${AGENT_VERSION}.exe`} download className="inline-flex items-center justify-center rounded-md text-sm font-medium bg-primary text-primary-foreground hover:bg-primary/90 h-10 px-4 py-2 w-full">Télécharger (.exe)</a>
+            <p className="text-sm text-muted-foreground mb-4">Agent studioE5 pour Windows (64 bits)</p>
+            <a href={`/${AGENT_BIN_NAME}-v${AGENT_VERSION}.exe`} download className="inline-flex items-center justify-center rounded-md text-sm font-medium bg-primary text-primary-foreground hover:bg-primary/90 h-10 px-4 py-2 w-full">Télécharger (.exe)</a>
           </CardContent>
         </Card>
       </div>

server/app/layout.tsx

@@ -5,7 +5,7 @@ import "./globals.css";
 const inter = Inter({ subsets: ["latin"] });
 
 export const metadata: Metadata = {
-  title: "EduBox V2",
+  title: "studioE5",
   description: "Plateforme de gestion d'instances pour l'enseignement BTS",
 };