feat(config/m7-363): branding config field + defaults

internal/config/config.go

@@ -19,6 +19,7 @@ type Config struct {
 	Subsonic       SubsonicConfig       `yaml:"subsonic"`
 	Events         EventsConfig         `yaml:"events"`
 	Recommendation RecommendationConfig `yaml:"recommendation"`
+	Branding       BrandingConfig       `yaml:"branding"`
 }
 
 type ServerConfig struct {
@@ -37,6 +38,14 @@ type StorageConfig struct {
 	DataDir string `yaml:"data_dir"`
 }
 
+// BrandingConfig drives per-instance UI labelling: the app name shown
+// in the header / tab title and the description used in OG share-preview
+// metadata. Both default to sensible values when unset.
+type BrandingConfig struct {
+	AppName     string `yaml:"app_name"`
+	Description string `yaml:"description"`
+}
+
 type DatabaseConfig struct {
 	URL string `yaml:"url"`
 }
@@ -98,6 +107,10 @@ func Default() Config {
 		Storage:  StorageConfig{DataDir: "./data"},
 		Database: DatabaseConfig{URL: ""},
 		Log:      LogConfig{Level: "info", Format: "text"},
+		Branding: BrandingConfig{
+			AppName:     "Minstrel",
+			Description: "Self-hosted music server with Subsonic compatibility, smart shuffle, and Lidarr integration.",
+		},
 		Events: EventsConfig{
 			SessionTimeoutMinutes:   30,
 			SkipMaxCompletionRatio:  0.5,
@@ -150,6 +163,12 @@ func applyEnv(cfg *Config) {
 	if v, ok := os.LookupEnv("SMARTMUSIC_LOG_FORMAT"); ok {
 		cfg.Log.Format = strings.ToLower(v)
 	}
+	if v, ok := os.LookupEnv("SMARTMUSIC_BRANDING_APP_NAME"); ok {
+		cfg.Branding.AppName = v
+	}
+	if v, ok := os.LookupEnv("SMARTMUSIC_BRANDING_DESCRIPTION"); ok {
+		cfg.Branding.Description = v
+	}
 	if v, ok := os.LookupEnv("SMARTMUSIC_AUTH_ADMIN_USERNAME"); ok {
 		cfg.Auth.AdminBootstrap.Username = v
 	}