Replace zerolog with log/slog from stdlib

- Rewrite logger package to use slog with LevelVar for dynamic levels
- Update all packages to use *slog.Logger instead of *zerolog.Logger
- Use TextHandler for TTY (dev), JSONHandler for production
- Add make check target (runs lint + test)
- Add make test target

internal/database/database.go

@@ -2,10 +2,10 @@ package database
 
 import (
 	"context"
+	"log/slog"
 
 	"git.eeqj.de/sneak/gohttpserver/internal/config"
 	"git.eeqj.de/sneak/gohttpserver/internal/logger"
-	"github.com/rs/zerolog"
 	"go.uber.org/fx"
 
 	// spooky action at a distance!
@@ -26,7 +26,7 @@ type DatabaseParams struct {
 
 type Database struct {
 	URL    string
-	log    *zerolog.Logger
+	log    *slog.Logger
 	params *DatabaseParams
 }
 
@@ -35,11 +35,11 @@ func New(lc fx.Lifecycle, params DatabaseParams) (*Database, error) {
 	s.params = &params
 	s.log = params.Logger.Get()
 
-	s.log.Info().Msg("Database instantiated")
+	s.log.Info("Database instantiated")
 
 	lc.Append(fx.Hook{
 		OnStart: func(ctx context.Context) error {
-			s.log.Info().Msg("Database OnStart Hook")
+			s.log.Info("Database OnStart Hook")
 			// FIXME connect to db
 			return nil
 		},