feat(qbzd): setup subcommand placeholder + config save helper

CLI now shows all 5 subcommands: login, status, token, setup, help.
Setup placeholder ready for TUI wizard implementation (ratatui).
Config save helper for persisting changes to qbzd.toml.

cc

crates/qbzd/src/config.rs

@@ -257,3 +257,21 @@ pub fn generate_token() -> String {
         .as_nanos();
     format!("{:032x}", seed)
 }
+
+/// Save config to the default config path (creates dir if needed).
+pub fn save_default_config(config: &DaemonConfig) -> Result<(), String> {
+    let config_dir = dirs::config_dir()
+        .ok_or("Could not determine config directory")?
+        .join("qbz");
+    std::fs::create_dir_all(&config_dir)
+        .map_err(|e| format!("Failed to create config dir: {}", e))?;
+
+    let path = config_dir.join("qbzd.toml");
+    let content = toml::to_string_pretty(config)
+        .map_err(|e| format!("Failed to serialize config: {}", e))?;
+    std::fs::write(&path, content)
+        .map_err(|e| format!("Failed to write config: {}", e))?;
+
+    log::info!("[qbzd] Config saved to {}", path.display());
+    Ok(())
+}

crates/qbzd/src/main.rs

@@ -57,6 +57,12 @@ enum Commands {
     Status,
     /// Show or regenerate API token
     Token,
+    /// Interactive setup wizard (audio, playback, integrations)
+    Setup {
+        /// Run only a specific section (audio, playback, cache, integrations, qconnect)
+        #[arg(long)]
+        section: Option<String>,
+    },
 }
 
 #[tokio::main]
@@ -124,6 +130,13 @@ async fn main() {
                 }
             }
         }
+        Some(Commands::Setup { section }) => {
+            eprintln!("TUI setup wizard not yet implemented.");
+            if let Some(s) = section {
+                eprintln!("Requested section: {}", s);
+            }
+            eprintln!("Use the HTTP API or qbzd.toml to configure for now.");
+        }
         Some(Commands::Token) => {
             if cfg.server.token == "auto" {
                 let token = config::generate_token();