feat: query metrics extension, retry utility, and DTO input sanitization

[Cjay-Cyber-2]

Conflict-free resolution of PR #368 changes onto current main.

Changes

New files:

• src/database/query-metrics.extension.ts — Prisma extension that logs slow queries above slowQueryThresholdMs
• src/database/query-metrics.extension.spec.ts — tests for the metrics extension
• src/utils/retry.util.ts — retryWithBackoff using exponentialBackoffWithJitter
• src/utils/retry.util.spec.ts — comprehensive retry utility tests
• src/common/validators/text-field.sanitizer.ts — sanitizeTextField (collapse/trim whitespace)
• src/common/validators/text-field.sanitizer.spec.ts — tests for text field sanitizer
• src/modules/organizations/organization.dto.spec.ts — tests for organization Zod schemas

Modified files:

• src/config/database.config.ts — add slowQueryThresholdMs to DatabaseConfig
• src/config/env.validation.ts — add DATABASE_SLOW_QUERY_THRESHOLD_MS env var (default 1000ms)
• src/database/prisma.service.ts — chain createQueryMetricsExtension before createQueryTimeoutExtension
• src/database/prisma.service.spec.ts — chainable $extends mock + slowQueryThresholdMs: 1000
• src/queues/dlq.processor.ts — wrap domainEvents.create with retryWithBackoff
• src/queues/dlq.processor.spec.ts — add two retry test cases
• src/integrations/stellar/horizon-stellar.client.ts — wrap loadAccount/getTransaction calls with retryWithBackoff
• src/modules/organizations/organization.dto.ts — add .strict() and sanitizeTextField transforms to all schemas

🤖 Generated with Claude Code

https://claude.ai/code/session_012xRrTYwEy2y8yow4o8iUQ8

---

Generated by Claude Code