Feature: Add API request/response logging middleware

[Smartdevs17]

Problem

No middleware logs incoming requests or outgoing responses. Debugging production issues requires correlating logs manually.

Context

Request/response logging is essential for debugging, monitoring, and auditing API usage patterns.

Proposed Solution

Add middleware that logs: method, path, status code, response time, request ID.

Acceptance Criteria

• All requests logged with method, path, and timestamp
• Responses logged with status code and duration
• Sensitive fields (secrets, tokens) excluded from logs
• Request ID included (see related issue)
• Configurable log level (debug in dev, info in prod)

Technical Notes

• File: New api/src/middleware/requestLogger.ts, update api/src/app.ts

Constraints

• Must not log request bodies containing secrets
• Must not significantly impact response latency

[drips-wave]

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