First start: create the config file and open the Config view

Without a config file arr-tui refused to start. It now creates an empty
one (private, with its directory) and opens the Config view. A service
with neither address nor key is "not configured", which validation
allows: its client returns ErrNotConfigured without a request, its
indicator stays grey, it is logged once as information, and its lists
say so instead of showing errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019reK4DUGYqDUjniWYJvwUW

internal/config/config_test.go

@@ -35,6 +35,7 @@ func TestParseErrors(t *testing.T) {
 		"missing key":   {`{"radarr":{"url":"http://a"},"sonarr":{"url":"http://b","apikey":"x"},"sabnzbd":{"url":"http://c","apikey":"x"}}`, "radarr: apikey is required"},
 		"bad url":       {`{"radarr":{"url":"localhost","apikey":"x"},"sonarr":{"url":"http://b","apikey":"x"},"sabnzbd":{"url":"http://c","apikey":"x"}}`, "must be an http(s) URL"},
 		"invalid json":  {`{`, "parsing config"},
+		"key only":      {`{"radarr":{"apikey":"x"}}`, "radarr: url is required"},
 	}
 	for name, tc := range tests {
 		t.Run(name, func(t *testing.T) {
@@ -200,3 +201,35 @@ func TestEffectiveValidates(t *testing.T) {
 		t.Error("an invalid config must not become effective")
 	}
 }
+
+func TestServicesMayBeLeftOut(t *testing.T) {
+	cfg, err := Parse([]byte(`{"radarr":{"url":"http://r","apikey":"k"}}`))
+	if err != nil {
+		t.Fatalf("a config with only Radarr must load: %v", err)
+	}
+	if !cfg.Radarr.Configured() || cfg.Sonarr.Configured() || cfg.SABnzbd.Configured() || !cfg.AnyConfigured() {
+		t.Errorf("configured: radarr %v sonarr %v sab %v", cfg.Radarr.Configured(), cfg.Sonarr.Configured(), cfg.SABnzbd.Configured())
+	}
+	empty, err := Parse([]byte(`{}`))
+	if err != nil || empty.AnyConfigured() {
+		t.Errorf("an empty config must load with nothing set up: %v", err)
+	}
+}
+
+func TestCreate(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "new", "dir", "config.json")
+	if err := Create(path); err != nil {
+		t.Fatal(err)
+	}
+	info, err := os.Stat(path)
+	if err != nil || info.Mode().Perm() != 0o600 {
+		t.Fatalf("file: %v %v", info, err)
+	}
+	if dir, _ := os.Stat(filepath.Dir(path)); dir.Mode().Perm() != 0o700 {
+		t.Errorf("directory mode %v", dir.Mode().Perm())
+	}
+	cfg, warnings, err := Load(path)
+	if err != nil || len(warnings) > 0 || cfg.AnyConfigured() {
+		t.Errorf("the new file must load cleanly: %v %v", warnings, err)
+	}
+}