Fix/polling timeout interval leak tsnocheck logging

[OxDev-max]

closes #671
closes #672
closes #673
closes #674

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FILES CHANGED:

• backend/src/modules/blockchain/stellar.service.ts
• backend/src/modules/email/email.service.ts
• backend/src/modules/medical-records/medical-records.controller.ts
• backend/src/modules/blockchain/blockchain-sync.service.ts
• backend/src/modules/blockchain/hash-anchoring.service.ts
• backend/src/modules/blockchain/contract-management.service.ts
• backend/src/modules/blockchain/contract-interaction.service.ts
• backend/src/modules/blockchain/payment-automation.service.ts
• backend/src/modules/stellar-wallet-management/stellar-wallet-management.service.ts
• backend/src/auth/auth.service.ts
• backend/src/auth/services/email.service.ts
• backend/src/modules/users/services/file-upload.service.ts

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What was fixed:

1. Soroban polling loop timeout (stellar.service.ts:210-221) — Added maxPollingAttempts = 30 counter; throws a descriptive error after 30 attempts (~30 seconds) instead of looping forever.
2. Email interval leak (email.service.ts) — Added OnModuleDestroy interface and onModuleDestroy() method that calls clearInterval(this.processorInterval), preventing dangling timers on teardown/hot-reload.
3. @ts-nocheck removal — Removed the directive from medical-records.controller.ts and all 7 blockchain/wallet/stellar-wallet-management service files, restoring TypeScript type checking to these high-risk modules. (Note: wallets.service.ts is gitignored and couldn't be committed, but the directive was removed locally.)
4. console.* → Logger — Replaced all raw console.error/console.log calls in auth.service.ts (3 occurrences), auth/services/email.service.ts (4 occurrences), and file-upload.service.ts (1 occurrence) with NestJS Logger instances, routing output through the structured logging pipeline.

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