feat(phase3): worker container + event bus + scheduled jobs

apps/worker:
- BullMQ nightly scheduler (cron 0 3 * * *)
- Redis Streams consumer-group per wired/active project
- Persists events to Event model

schema:
- Event model (streamId unique, project + type indexed)

apps/web/prisma/schema.prisma

@@ -79,6 +79,20 @@ model Project {
   updatedAt   DateTime @updatedAt
 }
 
+model Event {
+  id          String   @id @default(cuid())
+  streamId    String   @unique
+  projectKey  String
+  eventType   String
+  version     Int      @default(1)
+  payload     Json
+  occurredAt  DateTime
+  receivedAt  DateTime @default(now())
+
+  @@index([projectKey, occurredAt])
+  @@index([eventType])
+}
+
 model AuditLog {
   id              String   @id @default(cuid())
   actorUserId     String?