feat(service): implement graceful shutdown for HTTP server

Add a context with timeout to handle graceful shutdown of the HTTP 
server. Update error handling during the server's close to include 
context-aware shutdown. Ensure that the server properly logs only 
non-closed errors when listening.

graph/resolver.go

@@ -3,8 +3,8 @@ package graph
 import (
 	"context"
 	"fmt"
+	"log/slog"
 
-	"github.com/apex/log"
 	"gitlab.com/unboundsoftware/eventsourced/eventsourced"
 
 	"gitlab.com/unboundsoftware/schemas/cache"
@@ -26,7 +26,7 @@ type Publisher interface {
 type Resolver struct {
 	EventStore eventsourced.EventStore
 	Publisher  Publisher
-	Logger     log.Interface
+	Logger     *slog.Logger
 	Cache      *cache.Cache
 }