fix: 注册DevicePlugin到main.rs — 修复防息屏/光标功能失效(P0)

ScreenPlugin重构为thin wrapper后main.rs未注册DevicePlugin,
导致DeviceCommand消息无接收者。现在DevicePlugin在Screen之前注册。

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

src/main.rs

@@ -5,7 +5,8 @@ use showen_v2::core::service_manager::ServiceManager;
 #[cfg(not(test))]
 use showen_v2::core::version_manager::VersionManager;
 use showen_v2::plugins::{
-    ble::BlePlugin, http::HttpPlugin, screen::ScreenPlugin, video::VideoPlugin, wifi::WifiPlugin,
+    ble::BlePlugin, device::DevicePlugin, http::HttpPlugin, screen::ScreenPlugin,
+    video::VideoPlugin, wifi::WifiPlugin,
 };
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
@@ -48,10 +49,13 @@ fn main() -> Result<()> {
     let mut manager = ServiceManager::new(config);
 
     // 按依赖顺序注册插件
-    // 独立插件：screen, wifi, video, ble
+    // 独立插件：device, screen, wifi, video, ble
     // 依赖插件：http (依赖 video)
 
     println!("注册插件...");
+    manager.register(Box::new(DevicePlugin::new_default()));
+    println!("  ✓ DevicePlugin");
+
     manager.register(Box::new(ScreenPlugin::new()));
     println!("  ✓ ScreenPlugin");