Feat/issues 1136 1137 1138 1145

[A6dulmalik]

Summary

Combined PR addressing 4 assigned issues across assessment pagination, security hardening, and observability.

Changes

#1136 - Paginate assessment listing, drop eager question hydration

• AssessmentsService.findAll() now paginated (page/limit) without loading question entities
• Questions remain available on detail endpoint (findOne)
• GET /assessments endpoint added with pagination query params
• @Index() added on createdAt for ordering performance
• Tests verify pagination metadata and no question hydration

#1137 - Paginate grading listings (question-bank, rubrics, feedback-templates)

• QuestionBankService.findByAssessment, RubricsService.findAll, FeedbackTemplatesService.findAll all paginated with page/limit/max page size
• GradingController passes page/limit query params to rubrics and feedback-templates list endpoints
• @Index() added on createdAt for rubrics, feedback_templates, and questions tables
• Tests enforce page-size ceiling

#1138 - Timestamp freshness + nonce replay protection in RequestSigningService

• Timestamp validated against configurable freshness window (REQUEST_SIGNING_FRESHNESS_MS, default 5 min)
• Nonce tracked in Redis with SET NX + TTL; rejected on reuse
• verifySignedRequest() returns {valid, reason}
• Registered in SecurityModule, backed by tests for expired, replayed, and valid requests

#1145 - Correlation-ID and structured error context for background job failures

• QueueService.addJob now embeds correlation ID via enrichWithCorrelation()
• BaseWorker error logging emits structured JSON with event type, job name, job ID, attempt count, correlation ID, and error message
• Tests verify structured log output on failure

Closes #1136 , Closes #1137 , Closes #1138 , Closes #1145

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