feat(agent,server): v0.2.7 - mu-plugin WordPress robuste, réparation wp-config, proxy cookies/headers

- Agent: mu-plugin embarqué amélioré (HTTPS forcé, filtres URL, localhost:port)
- Agent: suppression des WP_HOME/WP_SITEURL hardcodés au démarrage des instances
- Server/proxy: envoi X-Forwarded-Port, réécriture headers/body élargie
- Server/proxy: sanitization des Set-Cookie (Secure, SameSite, Domain)
- Dashboard: version agent 0.2.7, action Supprimer complète
- Cleanup: binaires agent 0.2.3-0.2.6 remplacés par 0.2.7

server/app/api/instances/route.ts

@@ -99,7 +99,7 @@ export async function PATCH(req: NextRequest) {
   const publicUrl = domain ? `https://${instance.id}.${domain}` : null;
 
   if (action === "stop") {
-    sendToNode(instance.nodeId, { action: "stop", instanceId: instance.id });
+    sendToNode(instance.nodeId, { action: "delete", instanceId: instance.id });
     await prisma.instance.update({ where: { id }, data: { status: "stopped" } });
   } else if (action === "start") {
     const sent = sendToNode(instance.nodeId, {
@@ -126,7 +126,7 @@ export async function DELETE(req: NextRequest) {
   const id = searchParams.get("id");
   if (!id) return NextResponse.json({ error: "Missing id" }, { status: 400 });
   const instance = await prisma.instance.findUnique({ where: { id } });
-  if (instance) sendToNode(instance.nodeId, { action: "stop", instanceId: instance.id });
+  if (instance) sendToNode(instance.nodeId, { action: "delete", instanceId: instance.id });
   await prisma.instance.delete({ where: { id } });
   return NextResponse.json({ ok: true });
 }