feat(agent): v0.3.5 Windows inbound forwarding, UI actions, lifecycle

- Configure tailscale serve automatically for each instance on Windows userspace networking.
- Add local UI buttons: start/stop/reset/delete instances (stop/start preserve volumes).
- Clean shutdown: stop tailscaled and instances, notify server with instance_stopped.
- Restart tailscaled on agent boot using persisted state when pre-auth key is absent.
- Sync instance stopped/deleted status to dashboard (server/lib/websocket.ts).
- Security: include prior authz/scoping changes across API routes, ephemeral pre-auth keys, ACL policy, internal API key.
- Update SUIVI_VPN_ONDEMAND.md and docs/ONBOARDING_CLIENT.md.
- Bump agent version to 0.3.5.

server/app/api/establishments/route.ts

@@ -1,9 +1,15 @@
 import { NextRequest, NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
 import { hashPassword } from "@/lib/auth";
+import { requireAuth, requireRole } from "@/lib/api-auth";
 
 export async function GET() {
+  const user = await requireAuth();
+  if (user instanceof NextResponse) return user;
+
+  const where = user.role === "superadmin" ? {} : { id: user.establishmentId };
   const establishments = await prisma.establishment.findMany({
+    where,
     include: { subscription: true, _count: { select: { users: true, classes: true } } },
     orderBy: { createdAt: "desc" },
   });
@@ -11,6 +17,12 @@ export async function GET() {
 }
 
 export async function POST(req: NextRequest) {
+  const user = await requireAuth();
+  if (user instanceof NextResponse) return user;
+
+  const denied = requireRole(user, "superadmin");
+  if (denied) return denied;
+
   const body = await req.json();
   const { name, slug, adminEmail, adminPassword } = body;