fix(server): remove misleading "Agent not available" warning.

Signed-off-by: Deluan <deluan@navidrome.org>

core/agents/agents_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/navidrome/navidrome/consts"
 	"github.com/navidrome/navidrome/model"
 	"github.com/navidrome/navidrome/tests"
+	"github.com/navidrome/navidrome/utils/slice"
 
 	"github.com/navidrome/navidrome/conf"
 	. "github.com/onsi/ginkgo/v2"
@@ -44,19 +45,21 @@ var _ = Describe("Agents", func() {
 		var mock *mockAgent
 		BeforeEach(func() {
 			mock = &mockAgent{}
-			Register("fake", func(ds model.DataStore) Interface {
-				return mock
-			})
-			Register("empty", func(ds model.DataStore) Interface {
-				return struct {
-					Interface
-				}{}
-			})
-			conf.Server.Agents = "empty,fake"
+			Register("fake", func(model.DataStore) Interface { return mock })
+			Register("disabled", func(model.DataStore) Interface { return nil })
+			Register("empty", func(model.DataStore) Interface { return &emptyAgent{} })
+			conf.Server.Agents = "empty,fake,disabled"
 			ag = New(ds)
 			Expect(ag.AgentName()).To(Equal("agents"))
 		})
 
+		It("does not register disabled agents", func() {
+			ags := slice.Map(ag.agents, func(a Interface) string { return a.AgentName() })
+			// local agent is always appended to the end of the agents list
+			Expect(ags).To(HaveExactElements("empty", "fake", "local"))
+			Expect(ags).ToNot(ContainElement("disabled"))
+		})
+
 		Describe("GetArtistMBID", func() {
 			It("returns on first match", func() {
 				Expect(ag.GetArtistMBID(ctx, "123", "test")).To(Equal("mbid"))
@@ -344,3 +347,11 @@ func (a *mockAgent) GetAlbumInfo(ctx context.Context, name, artist, mbid string)
 		},
 	}, nil
 }
+
+type emptyAgent struct {
+	Interface
+}
+
+func (e *emptyAgent) AgentName() string {
+	return "empty"
+}