fix(backup): fold a pre-0343 Coach availability key on instance restore

Migration 0343 moved the operator's Coach answer from module availability
into the Coach switch and folded every live row. Restoring the instance
settings from an older file wrote the dead coach key back into module
availability and left the Coach switch on, so a Coach the operator had off
came back.

The restore now applies the same fold: coach false in the file's module
availability switches the Coach off, and the key is dropped either way.

src/app/api/admin/backups/[id]/restore/route.ts

@@ -71,6 +71,7 @@ import { restoreAwardsData } from "@/lib/export/awards-backup";
 import { restoreEnvironmentData } from "@/lib/export/environment-backup";
 import { restoreEcgData } from "@/lib/export/ecg-backup";
 import { invalidateUserData } from "@/lib/cache/invalidate";
+import { foldLegacyCoachAvailability } from "@/lib/modules/operator-availability";
 
 export const dynamic = "force-dynamic";
 
@@ -483,6 +484,12 @@ const handler = apiHandler(
           // the account restore assumes.
           if (payload.appSettings && restoreInstanceSettings) {
             const settings = payload.appSettings;
+            // A file from before 0343 carries the Coach's operator answer in
+            // module availability; carry it into the Coach switch.
+            const coachFold = foldLegacyCoachAvailability(
+              settings.moduleAvailabilityJson,
+              settings.assistantCoachEnabled,
+            );
             const settingsData = {
               registrationEnabled: settings.registrationEnabled,
               mfaRequired: settings.mfaRequired,
@@ -523,13 +530,13 @@ const handler = apiHandler(
                 settings.adminAiInsightsFeedbackSummary as never,
               defaultUserTimezone: settings.defaultUserTimezone,
               assistantEnabled: settings.assistantEnabled,
-              assistantCoachEnabled: settings.assistantCoachEnabled,
+              assistantCoachEnabled: coachFold.assistantCoachEnabled,
               assistantBriefingEnabled: settings.assistantBriefingEnabled,
               assistantInsightStatusEnabled:
                 settings.assistantInsightStatusEnabled,
               assistantDocumentAiEnabled:
                 settings.assistantDocumentAiEnabled ?? true,
-              moduleAvailabilityJson: settings.moduleAvailabilityJson as never,
+              moduleAvailabilityJson: coachFold.moduleAvailabilityJson as never,
               documentMaxFileBytes: settings.documentMaxFileBytes,
               documentQuotaBytes: BigInt(settings.documentQuotaBytes),
             };