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feat: implement configurable logger middleware

Replaced the hardcoded `SlogMiddleware` with a flexible `Logger`
middleware that supports path exclusion via arguments.

*   Added `Logger` function with `excludedPaths` parameter.
*   Updated `ApiServer` to ignore `/metrics` and `/healthz`.
*   Added unit tests to verify logging and exclusion behavior.

```mermaid
sequenceDiagram
    participant C as Client
    participant M as Logger Middleware
    participant H as Handler

    C->>M: Request
    M->>H: c.Next()
    H-->>M: Response
    M->>M: Check if path is excluded
    alt Not Excluded
        M->>M: Log request details
    end
    M-->>C: Response
```