Add config and service subcommands

config subcommand — show, path, edit ($EDITOR), and a non-interactive
set that takes --prefix / --compat-dir / --gameid. Lets users retarget
the Wine prefix without hand-editing TOML.

service subcommand — install / uninstall / status for a systemd --user
unit that autostarts the tray. install writes ~/.config/systemd/user/
battlenet-manager.service with ExecStart pointing at the current binary,
then daemon-reloads and enable --now's the unit. uninstall tears it back
down.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main.rs

@@ -2,10 +2,12 @@ mod config;
 mod diagnose;
 mod launcher;
 mod proton;
+mod service;
 mod tray;
 
 use anyhow::Result;
 use clap::{Parser, Subcommand};
+use std::path::PathBuf;
 
 /// Battle.net launcher manager for Linux via umu/Proton-GE.
 ///
@@ -46,6 +48,52 @@ enum Commands {
         #[arg(long)]
         list: bool,
     },
+
+    /// Show or modify configuration
+    Config {
+        #[command(subcommand)]
+        action: ConfigAction,
+    },
+
+    /// Manage the systemd --user service that autostarts the tray
+    Service {
+        #[command(subcommand)]
+        action: ServiceAction,
+    },
+}
+
+#[derive(Subcommand)]
+enum ConfigAction {
+    /// Print the config file path and current values
+    Show,
+    /// Print just the config file path
+    Path,
+    /// Open the config file in $EDITOR
+    Edit,
+    /// Update one or more fields non-interactively
+    Set {
+        /// Wine prefix directory
+        #[arg(long, value_name = "PATH")]
+        prefix: Option<PathBuf>,
+
+        /// GE-Proton install directory
+        #[arg(long, value_name = "PATH")]
+        compat_dir: Option<PathBuf>,
+
+        /// umu GAMEID (used for protonfixes lookup)
+        #[arg(long, value_name = "ID")]
+        gameid: Option<String>,
+    },
+}
+
+#[derive(Subcommand)]
+enum ServiceAction {
+    /// Write the unit, daemon-reload, and enable+start the service
+    Install,
+    /// Stop, disable, and remove the unit file
+    Uninstall,
+    /// Show `systemctl --user status` for the service
+    Status,
 }
 
 fn main() -> Result<()> {
@@ -60,6 +108,22 @@ fn main() -> Result<()> {
         Commands::UpdateProton { latest, version, list } => {
             proton::run(&config, latest, version, list)?;
         }
+        Commands::Config { action } => match action {
+            ConfigAction::Show => config.show()?,
+            ConfigAction::Path => {
+                println!("{}", config::Config::config_path()?.display());
+            }
+            ConfigAction::Edit => config::Config::edit()?,
+            ConfigAction::Set { prefix, compat_dir, gameid } => {
+                let mut c = config;
+                c.set_fields(prefix, compat_dir, gameid)?;
+            }
+        },
+        Commands::Service { action } => match action {
+            ServiceAction::Install => service::install()?,
+            ServiceAction::Uninstall => service::uninstall()?,
+            ServiceAction::Status => service::status()?,
+        },
     }
 
     Ok(())