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[Nanafancy]

[BE-31] Add structured request logging middleware with correlation IDs in opsce module

Problem
The backend has no request logging. When errors occur in production, there is no way to trace a request through the system or correlate incoming requests with outgoing responses in logs.

Proposed Solution
Create backend/src/opsce/common/middleware/logger.middleware.ts. Generate a UUID correlationId per request, attach it to request and response headers, and log structured JSON per request/response.

Acceptance Criteria
Each request gets a X-Correlation-Id UUID header (generated if not provided by the client)
Logs incoming request: method, URL, correlationId, userAgent, IP
Logs outgoing response: statusCode, duration in ms, correlationId
Sensitive headers (Authorization, Cookie) are redacted from logs
Middleware applied globally in OpsceModule
Log output is structured JSON for log aggregation compatibility
closes #756

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