map-services / fuel-prices-api / 26314158067

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refactor: replace log with structured slog (#63)

* refactor: replace log with structured slog

Migrated project logging to use `log/slog` for structured output.
Implemented a new `middleware.RequestLogger` to provide detailed,
structured request logging.

```mermaid
graph TD
    A[HTTP Request] --> B{RequestLogger Middleware}
    B -->|Log Request Data| C[slog.JSONHandler]
    C --> D[stderr]
```

* refactor: improve logging precision and formatting

- Trim whitespace from migration logs to improve output cleanliness.
- Switch to `RequestURI` to capture full query parameters in logs.
- Increase latency precision to sub-millisecond accuracy by using
  microseconds converted to float milliseconds.

* refactor: sanitize request path in logger

* Changed `RequestURI` to `URL.Path` to avoid logging query parameters
  in the request logs, improving security and log readability.

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