fix(lidarr): send the artist add's monitor choice in addOptions (#5239)

ArtistResource has no top-level `monitor`. Lidarr reads the choice from
AddOptions (AddArtistOptions, a MonitoringOptions), so the "all"/"future"
we sent there was dropped on deserialisation. AddOptions.Monitor stayed
Unknown, and AlbumMonitoredService.SetAlbumMonitoredStatus returns early
on Unknown. The request's monitoring was never applied.

Send monitor and monitored inside addOptions with searchForMissingAlbums,
the shape Lidarr's getNewArtist.js posts, and set monitorNewItems "all"
explicitly: both choices mean new releases are watched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/lidarr/client_test.go

@@ -288,13 +288,24 @@ func TestAddArtist_PostsCorrectBody(t *testing.T) {
 	if decoded["monitored"] != true {
 		t.Errorf("monitored = %v, want true", decoded["monitored"])
 	}
-	if decoded["monitor"] != "all" {
-		t.Errorf("monitor = %v, want all (MonitorAll=true)", decoded["monitor"])
+	if decoded["monitorNewItems"] != "all" {
+		t.Errorf("monitorNewItems = %v, want all", decoded["monitorNewItems"])
+	}
+	// #5239: ArtistResource has no top-level monitor; Lidarr reads the
+	// choice from addOptions and silently drops it anywhere else.
+	if _, set := decoded["monitor"]; set {
+		t.Errorf("monitor sent at top level (%v), where Lidarr ignores it", decoded["monitor"])
 	}
 	opts, ok := decoded["addOptions"].(map[string]any)
 	if !ok {
 		t.Fatalf("addOptions missing or wrong type: %T", decoded["addOptions"])
 	}
+	if opts["monitor"] != "all" {
+		t.Errorf("addOptions.monitor = %v, want all (MonitorAll=true)", opts["monitor"])
+	}
+	if opts["monitored"] != true {
+		t.Errorf("addOptions.monitored = %v, want true", opts["monitored"])
+	}
 	if opts["searchForMissingAlbums"] != true {
 		t.Errorf("addOptions.searchForMissingAlbums = %v, want true", opts["searchForMissingAlbums"])
 	}
@@ -309,8 +320,8 @@ func TestAddArtist_MonitorFuture(t *testing.T) {
 	defer srv.Close()
 
 	_ = c.AddArtist(context.Background(), AddArtistParams{MonitorAll: false})
-	if decoded["monitor"] != "future" {
-		t.Errorf("monitor = %v, want future (MonitorAll=false)", decoded["monitor"])
+	if opts, _ := decoded["addOptions"].(map[string]any); opts["monitor"] != "future" {
+		t.Errorf("addOptions.monitor = %v, want future (MonitorAll=false)", opts["monitor"])
 	}
 }