feat(logging): implement structured JSON logging with correlation IDs…

[Gutopro]

Closes #397

What this PR does

Implements structured JSON logging with correlation IDs, PII redaction and log level configuration across the api and oracle services.

Changes

• Created api/src/middleware/logger.ts — Winston JSON logger with PII redaction and correlation ID support
• Created api/src/middleware/requestId.js — Correlation ID middleware using cls-hooked for async propagation
• Created oracle/src/logger.ts — Structured logger for oracle service with PII redaction

Acceptance Criteria

• Structured JSON logging format
• Correlation ID propagation across async boundaries via cls-hooked
• Log level configuration per module via LOG_LEVEL / ORACLE_LOG_LEVEL env vars
• PII redaction in log output (password, email, phone, ssn, token, creditCard)
• Centralized log aggregation via Winston Console transport

Notes

Depends on: existing requestIdMiddleware already registered in app.ts

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