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/handlers/handlers.go

@@ -3,13 +3,13 @@ package handlers
 import (
 	"context"
 	"encoding/json"
+	"log/slog"
 	"net/http"
 
 	"git.eeqj.de/sneak/gohttpserver/internal/database"
 	"git.eeqj.de/sneak/gohttpserver/internal/globals"
 	"git.eeqj.de/sneak/gohttpserver/internal/healthcheck"
 	"git.eeqj.de/sneak/gohttpserver/internal/logger"
-	"github.com/rs/zerolog"
 	"go.uber.org/fx"
 )
 
@@ -23,7 +23,7 @@ type HandlersParams struct {
 
 type Handlers struct {
 	params *HandlersParams
-	log    *zerolog.Logger
+	log    *slog.Logger
 	hc     *healthcheck.Healthcheck
 }
 
@@ -47,7 +47,7 @@ func (s *Handlers) respondJSON(w http.ResponseWriter, r *http.Request, data inte
 	if data != nil {
 		err := json.NewEncoder(w).Encode(data)
 		if err != nil {
-			s.log.Error().Err(err).Msg("json encode error")
+			s.log.Error("json encode error", "error", err)
 		}
 	}
 }

internal/handlers/index.go

@@ -12,7 +12,7 @@ func (s *Handlers) HandleIndex() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		err := t.ExecuteTemplate(w, "index.html", nil)
 		if err != nil {
-			s.log.Error().Err(err).Msg("")
+			s.log.Error("template execution failed", "error", err)
 			http.Error(w, http.StatusText(500), 500)
 		}
 	}

internal/handlers/login.go

@@ -12,7 +12,7 @@ func (s *Handlers) HandleLoginGET() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		err := t.ExecuteTemplate(w, "login.html", nil)
 		if err != nil {
-			s.log.Error().Err(err).Msg("")
+			s.log.Error("template execution failed", "error", err)
 			http.Error(w, http.StatusText(500), 500)
 		}
 	}

internal/handlers/signup.go

@@ -12,7 +12,7 @@ func (s *Handlers) HandleSignupGET() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		err := t.ExecuteTemplate(w, "signup.html", nil)
 		if err != nil {
-			s.log.Error().Err(err).Msg("")
+			s.log.Error("template execution failed", "error", err)
 			http.Error(w, http.StatusText(500), 500)
 		}
 	}
@@ -27,7 +27,7 @@ func (s *Handlers) HandleSignupPOST() http.HandlerFunc {
 		err := t.ExecuteTemplate(w, "signup.html", nil)
 
 		if err != nil {
-			s.log.Error().Err(err).Msg("")
+			s.log.Error("template execution failed", "error", err)
 			http.Error(w, http.StatusText(500), 500)
 		}
 	}