#1389 Paused subscriptions with a resumeAt are never automatically resumed

[Olamidepy]

Added validation to reject past or invalid resumeAt dates with BadRequestException('resumeAt must be a future date').
When a future resumeAt is provided, calculates delay = resumeDate.getTime() - Date.now() and enqueues a delayed JOB_NAMES.RESUME_SUBSCRIPTION job in Bull queue with retry (attempts: 3, exponential backoff) and auto-removal on complete.
When resumeAt is omitted, the subscription pauses indefinitely without scheduling a queue job.
Idempotent Job Processing in

SubscriptionJobProcessor
:

Implemented @process(JOB_NAMES.RESUME_SUBSCRIPTION) handleResumeSubscription.
Safely handles missing subscriptions and cancelled subscriptions as clean no-ops.
Guards against double-resumption by returning early if isPaused is false.
Transitions paused subscriptions back to ACTIVE via SubscriptionsService.resumeSubscription().
Module Registration in

PaymentsModule
:

Registered QUEUE_NAMES.SUBSCRIPTIONS with BullModule.registerQueue.
Registered SubscriptionsService, SubscriptionsController, and SubscriptionJobProcessor.
Automated Unit Tests:

closes #1389

subscriptions.service.spec.ts
(7 tests covering past date rejection, pause with/without resumeAt, queue scheduling, and resume handling).

subscription-job.processor.spec.ts
(7 tests covering auto-resume execution, idempotency, cancelled/missing subscription safety, and Bull retry propagation).
All 14 tests pass and pnpm build compiles cleanly with 0 errors.

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[Olamidepy]

Pls merge....... . @RUKAYAT-CODER