Slog logging

[MichaelBoegner]

Summary

This PR replaces Go's standard log package with structured logging using the slog package. The changes add a logger instance to the Handler struct and update all logging statements to use the structured logger instead of the standard library's log.Printf calls.

• Adds structured logging with slog.Logger throughout the handlers package and corresponding services using structs/methods (will be added to remaining services after they are converted to structs/methods)
• Updates the Handler struct to include a logger field and modifies the constructor to accept it
• Replaces all log.Printf calls with h.Logger.Error calls for consistent structured logging

[Copilot]

Pull Request Overview

This PR replaces Go's standard log package with structured logging using the slog package. The changes add a logger instance to the Handler struct and update all logging statements to use the structured logger instead of the standard library's log.Printf calls.

• Adds structured logging with slog.Logger throughout the handlers package
• Updates the Handler struct to include a logger field and modifies the constructor to accept it
• Replaces all log.Printf calls with h.Logger.Error calls for consistent structured logging

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
internal/server/server.go	Removes test logging and passes logger to handler constructor
handlers/model.go	Adds logger field to Handler struct and updates constructor signature
handlers/handlers.go	Replaces all log.Printf calls with structured logger error calls

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 15 out of 15 changed files in this pull request and generated 8 comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 17 out of 17 changed files in this pull request and generated 4 comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}