feat(ST-xmwvqru1): admin jobs-actions (cancelJob, deleteJob)

- lib/session.ts: isAdmin: boolean toegevoegd
- lib/auth-guard.ts: requireAdmin() toegevoegd
- actions/admin/jobs.ts: cancelJobAction (CUID-validatie, eindstatus-check → CANCELLED),
  deleteJobAction (hard delete) — beide 'use server', revalidatePath('/admin/jobs')

actions/admin/jobs.ts

@@ -0,0 +1,41 @@
+'use server'
+
+import { revalidatePath } from 'next/cache'
+import { z } from 'zod'
+import { prisma } from '@/lib/prisma'
+import { requireAdmin } from '@/lib/auth-guard'
+
+const cuidSchema = z.string().cuid()
+
+export async function cancelJobAction(jobId: string) {
+  await requireAdmin()
+
+  const parsed = cuidSchema.safeParse(jobId)
+  if (!parsed.success) throw new Error('Ongeldig job-id')
+
+  const job = await prisma.claudeJob.findUnique({
+    where: { id: parsed.data },
+    select: { status: true },
+  })
+
+  if (!job) throw new Error('Job niet gevonden')
+  if (job.status === 'DONE' || job.status === 'FAILED' || job.status === 'CANCELLED') {
+    throw new Error('Job is al in eindstatus')
+  }
+
+  await prisma.claudeJob.update({
+    where: { id: parsed.data },
+    data: { status: 'CANCELLED', finished_at: new Date() },
+  })
+  revalidatePath('/admin/jobs')
+}
+
+export async function deleteJobAction(jobId: string) {
+  await requireAdmin()
+
+  const parsed = cuidSchema.safeParse(jobId)
+  if (!parsed.success) throw new Error('Ongeldig job-id')
+
+  await prisma.claudeJob.delete({ where: { id: parsed.data } })
+  revalidatePath('/admin/jobs')
+}