feat: improve admin upgrade logs

src/app/api/admin/upgrade/route.ts

@@ -50,7 +50,7 @@ export async function GET(request: NextRequest) {
     const states = await readStates();
     return NextResponse.json({
       latest: states[0] || null,
-      history: states.slice(0, 12),
+      history: states,
       stateDir: getUpgradeStateRoot(),
       running: states.some(job => RUNNING_STATUSES.has(job.status)),
     });