feat(api): add fleet snapshots and durable event stream

apps/api/src/infrastructure/database/database.test.ts

@@ -62,6 +62,7 @@ describe('database migrations', () => {
       'app_settings',
       'audit_events',
       'capabilities',
+      'event_journal',
       'instance_tags',
       'instances',
       'job_attempts',
@@ -117,6 +118,7 @@ describe('database migrations', () => {
     expect(indexes).toEqual(
       expect.arrayContaining([
         'idx_audit_events_created_at',
+        'idx_event_journal_sequence',
         'idx_jobs_status_created_at',
         'idx_status_snapshots_instance_observed_at',
       ]),