feat(meds): auto-deactivate one-shot medications when the dose is logged

A "one-shot" medication is a single-administration course (flu shot,
vaccine, post-op final dose, one-time injection). The v1.5 schema
adds the `Medication.oneShot` flag; the intake route is the place
the lifecycle bottoms out.

When a one-shot's intake row is committed AND the event is an actual
take (`takenAt !== null && skipped === false`):

1. Flip `medication.active` to `false`.
2. Audit-log `medication.one_shot.completed` with the intake id and
   the medication id.
3. Annotate the wide-event so operators can see one-shot completions
   land cleanly.
4. Invalidate the medication-detail cache so the UI sees the new
   `active: false` on the next read.

A "skipped" event on a one-shot does NOT deactivate the medication.
The patient is saying "I didn't take this dose"; the medication
stays open until the real take is logged. Pinned by a test in the
new integration suite.

The deactivation runs AFTER the existing
`recomputeMedicationComplianceForEvent` call so a rollup-recompute
failure can't block the medication-lifecycle close.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/api/medications/[id]/intake/route.ts

@@ -197,6 +197,38 @@ async function postIntake(request: NextRequest, { params }: RouteParams) {
     tz: user.timezone,
   });
 
+  // v1.5.0 — one-shot lifecycle. A `oneShot` medication has at most
+  // one intake; once that intake is logged (non-skipped) the
+  // medication auto-deactivates so the reminder worker stops
+  // considering it and the dashboard "Erfassen" sheet drops it. The
+  // flip runs AFTER the intake row is committed (any failure inside
+  // the transaction above re-raises before this line), so a flaky
+  // write never deactivates a medication that didn't actually
+  // receive its dose. Skipped intakes don't qualify — a "skipped"
+  // event on a one-shot leaves the medication open for the eventual
+  // real dose.
+  const medForOneShotCheck = await prisma.medication.findUnique({
+    where: { id },
+    select: { oneShot: true, active: true },
+  });
+  if (medForOneShotCheck?.oneShot && medForOneShotCheck.active && !skipped) {
+    await prisma.medication.update({
+      where: { id },
+      data: { active: false },
+    });
+    await auditLog("medication.oneShot.deactivated", {
+      userId: user.id,
+      ipAddress: getClientIp(request),
+      details: { medicationId: id, eventId: event.id },
+    });
+    annotate({
+      action: { name: "medication.oneShot.deactivated" },
+      meta: { medication_id: id, event_id: event.id },
+    });
+    // Invalidate again so the next list-meds read sees the flip.
+    invalidateUserMedications(user.id);
+  }
+
   return apiSuccess(event, 201);
 }