added auto update & changed config path

src/config.rs

@@ -9,6 +9,8 @@ pub struct Config {
     pub timeout_sec: u64,
     #[serde(default = "default_theme")]
     pub theme: Theme,
+    #[serde(default)]
+    pub update_api: Option<String>,
 }
 
 #[derive(Debug, Deserialize, Serialize, Clone)]
@@ -29,9 +31,16 @@ fn default_theme() -> Theme {
 
 impl Config {
     pub fn load() -> Result<Self> {
-        let config_path = dirs::config_dir()
-            .unwrap_or_else(|| PathBuf::from("."))
-            .join("tui-client")
+        // Respect XDG_CONFIG_HOME; fall back to ~/.config on all platforms.
+        let config_base = std::env::var("XDG_CONFIG_HOME")
+            .map(PathBuf::from)
+            .unwrap_or_else(|_| {
+                dirs::home_dir()
+                    .unwrap_or_else(|| PathBuf::from("."))
+                    .join(".config")
+            });
+        let config_path = config_base
+            .join(env!("CARGO_PKG_NAME"))
             .join("config.toml");
 
         if !config_path.exists() {
@@ -39,6 +48,7 @@ impl Config {
                 server_url: "http://localhost:8080/api/menu".to_string(),
                 timeout_sec: 10,
                 theme: default_theme(),
+                update_api: None,
             };
             fs::create_dir_all(config_path.parent().unwrap())?;
             fs::write(config_path, toml::to_string_pretty(&default)?)?;