feat(ST-nma6ylbl): SessionData isAdmin + loginAction admin-redirect + must_reset_password-interceptie

- SessionData: isAdmin: boolean toegevoegd (na isDemo)
- loginAction: UserRole-query voor ADMIN, session.isAdmin gezet, redirect-volgorde:
  must_reset_password → /reset-password, adminRole → /admin, phone-UA, dashboard
- registerAction: session.isAdmin = false
- pair/claim route: session.isAdmin = false (QR-pairing is geen admin-flow)

actions/auth.ts

@@ -4,6 +4,7 @@ import { redirect } from 'next/navigation'
 import { cookies, headers } from 'next/headers'
 import { getIronSession } from 'iron-session'
 import { z } from 'zod'
+import { prisma } from '@/lib/prisma'
 import { registerUser, verifyUser } from '@/lib/auth'
 import { SessionData, sessionOptions } from '@/lib/session'
 import { checkRateLimit } from '@/lib/rate-limit'
@@ -45,6 +46,7 @@ export async function registerAction(_prevState: unknown, formData: FormData) {
   const session = await getIronSession<SessionData>(await cookies(), sessionOptions)
   session.userId = result.user!.id
   session.isDemo = false
+  session.isAdmin = false
   await session.save()
 
   redirect('/dashboard')
@@ -70,11 +72,22 @@ export async function loginAction(_prevState: unknown, formData: FormData) {
     return { error: 'Onjuiste gebruikersnaam of wachtwoord' }
   }
 
+  const adminRole = await prisma.userRole.findFirst({
+    where: { user_id: user.id, role: 'ADMIN' },
+  })
+
   const session = await getIronSession<SessionData>(await cookies(), sessionOptions)
   session.userId = user.id
   session.isDemo = user.is_demo
+  session.isAdmin = !!adminRole
   await session.save()
 
+  if (user.must_reset_password) {
+    redirect('/reset-password')
+  } else if (adminRole) {
+    redirect('/admin')
+  }
+
   // PBI-11 / ST-1135: telefoon-UA's krijgen de mobile-shell.
   // Tablets en desktop volgen het bestaande /dashboard-pad.
   const ua = (await headers()).get('user-agent')

app/api/auth/pair/claim/route.ts

@@ -88,6 +88,7 @@ export async function POST(request: Request) {
   const session = await getIronSession<SessionData>(await cookies(), sessionOptions)
   session.userId = pairing.user_id
   session.isDemo = pairing.user?.is_demo ?? false
+  session.isAdmin = false
   session.paired = true
   session.pairedExpiresAt = Date.now() + PAIRED_TTL_MS
   await session.save()

lib/session.ts

@@ -3,6 +3,7 @@ import { SessionOptions } from 'iron-session'
 export interface SessionData {
   userId: string
   isDemo: boolean
+  isAdmin: boolean
   // ST-1002 (M10) — gezet door /api/auth/pair/claim na een succesvolle QR-pairing.
   // Beide velden zijn optioneel zodat bestaande wachtwoord-sessies onveranderd blijven.
   paired?: boolean