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.

cache/cache.go

@@ -2,9 +2,9 @@ package cache
 
 import (
 	"fmt"
+	"log/slog"
 	"time"
 
-	"github.com/apex/log"
 	"github.com/sparetimecoders/goamqp"
 
 	"gitlab.com/unboundsoftware/schemas/domain"
@@ -18,7 +18,7 @@ type Cache struct {
 	services      map[string]map[string]map[string]struct{}
 	subGraphs     map[string]string
 	lastUpdate    map[string]string
-	logger        log.Interface
+	logger        *slog.Logger
 }
 
 func (c *Cache) OrganizationByAPIKey(apiKey string) *domain.Organization {
@@ -98,7 +98,7 @@ func (c *Cache) Update(msg any, _ goamqp.Headers) (any, error) {
 	case *domain.SubGraph:
 		c.updateSubGraph(m.OrganizationId, m.Ref, m.ID.String(), m.Service, m.ChangedAt)
 	default:
-		c.logger.Warnf("unexpected message received: %+v", msg)
+		c.logger.With("msg", msg).Warn("unexpected message received")
 	}
 	return nil, nil
 }
@@ -124,7 +124,7 @@ func (c *Cache) addUser(sub string, organization domain.Organization) {
 	}
 }
 
-func New(logger log.Interface) *Cache {
+func New(logger *slog.Logger) *Cache {
 	return &Cache{
 		organizations: make(map[string]domain.Organization),
 		users:         make(map[string][]string),