feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/maintenance_migration_test.go

@@ -0,0 +1,33 @@
+package models
+
+import (
+	"testing"
+	"time"
+
+	"github.com/lib/pq"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMigratePreservesEveryLegacyStatusPageMaintenance(t *testing.T) {
+	Drop()
+	Migrate()
+	plan := Plan{Name: "legacy migration plan"}
+	require.NoError(t, DB().Create(&plan).Error)
+	account := Account{Name: "legacy migration account", PlanID: &plan.ID}
+	require.NoError(t, DB().Create(&account).Error)
+	page := StatusPage{AccountID: account.ID, Slug: "legacy-maintenance-migration", Name: "Legacy"}
+	require.NoError(t, DB().Create(&page).Error)
+	start := time.Date(2026, 7, 1, 12, 0, 0, 0, time.UTC)
+	for i := 0; i < 2; i++ {
+		row := StatusPageMaintenance{StatusPageID: page.ID, Title: "same", StartsAt: start, EndsAt: start.Add(time.Hour), MonitorIDs: pq.Int64Array{}}
+		require.NoError(t, DB().Create(&row).Error)
+	}
+
+	Migrate()
+	var migrated []Maintenance
+	require.NoError(t, DB().Where("legacy_status_page_maintenance_id IS NOT NULL").Find(&migrated).Error)
+	require.Len(t, migrated, 2)
+	var joins int64
+	require.NoError(t, DB().Table("maintenance_status_pages").Where("status_page_id = ?", page.ID).Count(&joins).Error)
+	require.EqualValues(t, 2, joins)
+}