Features/request

[samad13]

successfully implemented request and application logging:

1. Updated src/config/logger.ts : use env config instead of process.env, added JSON format for production logs
2. Created src/middleware/requestLogger.ts : a request logging middleware that logs method, url, status code, duration, ip, user‑agent
3. Updated src/app.ts : replaced old logging middleware with requestLogger, fixed all remaining process.env usage
4. Fixed circular dependency : removed logger import from env.ts to avoid circular dependency, use console.error for env validation errors (which is acceptable since those are fatal errors that exit the process anyway)
5. All tests pass!

Closes #6

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