add CLI parity flags and expand provider support

This brings the Go CLI closer to upstream behavior with global flag handling and clearer resolve failures, while adding Tidal video downloads plus initial Deezer and SoundCloud no-account flows for broader end-to-end coverage.

internal/provider/tidal/client_test.go

@@ -2,6 +2,7 @@ package tidal
 
 import (
 	"context"
+	"encoding/base64"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -50,3 +51,50 @@ func TestSearch(t *testing.T) {
 		t.Fatalf("pages = %d", len(pages))
 	}
 }
+
+func TestGetVideoDownloadable(t *testing.T) {
+	var server *httptest.Server
+	server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/v1/sessions":
+			_ = json.NewEncoder(w).Encode(map[string]any{"countryCode": "US", "userId": 123})
+		case "/v1/videos/42/playbackinfopostpaywall":
+			manifest := map[string]any{"urls": []string{server.URL + "/master.m3u8"}}
+			b, _ := json.Marshal(manifest)
+			_ = json.NewEncoder(w).Encode(map[string]any{"manifest": base64.StdEncoding.EncodeToString(b)})
+		case "/master.m3u8":
+			_, _ = w.Write([]byte("#EXTM3U\n#EXT-X-STREAM-INF:BANDWIDTH=1000,CODECS=\"avc1.42E01E,mp4a.40.2\",RESOLUTION=640x360\nlow/stream.m3u8\n#EXT-X-STREAM-INF:BANDWIDTH=2000,CODECS=\"avc1.4D401F,mp4a.40.2\",RESOLUTION=1280x720\nhi/stream.m3u8\n"))
+		default:
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer server.Close()
+
+	cfgData := config.DefaultConfigData()
+	cfgData.Tidal.AccessToken = "token"
+	cfgData.Tidal.CountryCode = "US"
+	c := New(&config.Config{File: cfgData, Session: cfgData})
+	c.baseURL = server.URL + "/v1"
+
+	if err := c.Login(context.Background()); err != nil {
+		t.Fatalf("login err = %v", err)
+	}
+	d, err := c.GetVideoDownloadable(context.Background(), "42")
+	if err != nil {
+		t.Fatalf("GetVideoDownloadable() err = %v", err)
+	}
+	if d.Extension != "mp4" {
+		t.Fatalf("extension = %q, want mp4", d.Extension)
+	}
+	if d.URL != server.URL+"/hi/stream.m3u8" {
+		t.Fatalf("url = %q, want %q", d.URL, server.URL+"/hi/stream.m3u8")
+	}
+}
+
+func TestBestHLSVariantURLFallsBackToMaster(t *testing.T) {
+	master := "https://example.com/master.m3u8"
+	got := bestHLSVariantURL(master, "#EXTM3U\n#comment")
+	if got != master {
+		t.Fatalf("url = %q, want %q", got, master)
+	}
+}