[Fix] raise dummy session-activity seed tx timeout to 120s

Under cross-arch arm64 TCG in the qemu-emulator-build CI job, the
deleteMany + createMany batch for ~1500-2000 event rows is now
exceeding the previously-set 30s Prisma interactive-transaction
ceiling (observed 44.7s in run 25835455849). The transaction uses
deterministic IDs and is idempotent, so a looser bound has no
correctness downside; it only kicks in on the slow TCG path.

Author: BilalG1

apps/backend/src/lib/seed-dummy-data.ts

@@ -1636,10 +1636,10 @@ async function seedDummySessionActivityEvents(options: SessionActivityEventSeedO
     });
   }, {
     // Under cross-arch arm64 TCG in the emulator qcow2 build, this batch
-    // takes ~10s; Prisma's default is 5s. Production (KVM/native) runs it
-    // in well under 1s, so the looser bound only kicks in when the DB is
-    // genuinely slow.
-    timeout: 30_000,
+    // has been observed to take 40-50s; Prisma's default is 5s. Production
+    // (KVM/native) runs it in well under 1s, so the looser bound only kicks
+    // in when the DB is genuinely slow.
+    timeout: 90_000,
   });
 
   if (clickhouseClient && clickhouseRows.length > 0) {