chore(brand): surface ccswitch.io as the sole official website

Add an "Only Official Website" header to the three READMEs, an
About panel button, and a tray menu entry — all pointing to
ccswitch.io. Consolidates brand and SEO signals on the canonical
domain across docs, GUI, and system tray.

src-tauri/src/tray.rs

@@ -5,6 +5,7 @@
 use once_cell::sync::Lazy;
 use tauri::menu::{CheckMenuItem, Menu, MenuBuilder, MenuItem, Submenu, SubmenuBuilder};
 use tauri::{Emitter, Manager};
+use tauri_plugin_opener::OpenerExt;
 
 use crate::app_config::AppType;
 use crate::error::AppError;
@@ -20,6 +21,7 @@ static TRAY_SECTION_SUBMENUS: Lazy<
 #[derive(Clone, Copy)]
 pub struct TrayTexts {
     pub show_main: &'static str,
+    pub open_website: &'static str,
     pub no_providers_label: &'static str,
     pub lightweight_mode: &'static str,
     pub quit: &'static str,
@@ -31,6 +33,7 @@ impl TrayTexts {
         match language {
             "en" => Self {
                 show_main: "Open main window",
+                open_website: "Open Official Website",
                 no_providers_label: "(no providers)",
                 lightweight_mode: "Lightweight Mode",
                 quit: "Quit",
@@ -38,6 +41,7 @@ impl TrayTexts {
             },
             "ja" => Self {
                 show_main: "メインウィンドウを開く",
+                open_website: "公式サイトを開く",
                 no_providers_label: "(プロバイダーなし)",
                 lightweight_mode: "軽量モード",
                 quit: "終了",
@@ -45,6 +49,7 @@ impl TrayTexts {
             },
             _ => Self {
                 show_main: "打开主界面",
+                open_website: "打开官方网站",
                 no_providers_label: "(无供应商)",
                 lightweight_mode: "轻量模式",
                 quit: "退出",
@@ -473,11 +478,22 @@ pub fn create_tray_menu(
     let mut section_handles: std::collections::HashMap<AppType, Submenu<tauri::Wry>> =
         std::collections::HashMap::new();
 
-    // 顶部：打开主界面
+    // 顶部：打开主界面 / 打开官方网站
     let show_main_item =
         MenuItem::with_id(app, "show_main", tray_texts.show_main, true, None::<&str>)
             .map_err(|e| AppError::Message(format!("创建打开主界面菜单失败: {e}")))?;
-    menu_builder = menu_builder.item(&show_main_item).separator();
+    let open_website_item = MenuItem::with_id(
+        app,
+        "open_website",
+        tray_texts.open_website,
+        true,
+        None::<&str>,
+    )
+    .map_err(|e| AppError::Message(format!("创建打开官方网站菜单失败: {e}")))?;
+    menu_builder = menu_builder
+        .item(&show_main_item)
+        .item(&open_website_item)
+        .separator();
 
     // Pre-compute proxy running state (used to disable official providers in tray menu)
     let is_proxy_running = futures::executor::block_on(app_state.proxy_service.is_running());
@@ -686,6 +702,11 @@ pub fn handle_tray_menu_event(app: &tauri::AppHandle, event_id: &str) {
                 }
             }
         }
+        "open_website" => {
+            if let Err(e) = app.opener().open_url("https://ccswitch.io", None::<String>) {
+                log::error!("打开官方网站失败: {e}");
+            }
+        }
         "lightweight_mode" => {
             if crate::lightweight::is_lightweight_mode() {
                 if let Err(e) = crate::lightweight::exit_lightweight_mode(app) {