core: Message Clone + ServiceManager Broadcast 完整实现

张明远交付:
- Message/PlayerCommand/WifiCommand/Destination 加 derive(Clone)
- Broadcast 分支遍历所有插件转发 msg.clone()
- running 标志控制主循环
- Manager 收到 Shutdown 时先广播给所有插件再停
- cargo check 零 warning

Co-Authored-By: GPT-5.4 <noreply@openai.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/core/message.rs

@@ -9,6 +9,7 @@ pub struct Envelope {
 }
 
 /// 消息目的地
+#[derive(Clone)]
 pub enum Destination {
     /// 点对点发送给指定插件
     Plugin(&'static str),
@@ -19,12 +20,19 @@ pub enum Destination {
 }
 
 /// 所有插件间通信的类型安全消息
+#[derive(Clone)]
 pub enum Message {
     // ── 播放控制 ──
     PlayerCommand(PlayerCommand),
     PlayerStatus(PlayerStatusData),
-    Trigger { name: String, value: String },
-    StateChanged { old_state: String, new_state: String },
+    Trigger {
+        name: String,
+        value: String,
+    },
+    StateChanged {
+        old_state: String,
+        new_state: String,
+    },
 
     // ── 屏幕管理 ──
     ScreenLockRequest(bool),
@@ -33,7 +41,10 @@ pub enum Message {
     // ── 网络 ──
     WifiCommand(WifiCommand),
     WifiResult(String),
-    WifiProvisioned { ssid: String, ip: String },
+    WifiProvisioned {
+        ssid: String,
+        ip: String,
+    },
 
     // ── 配置 ──
     ConfigReloaded(Arc<AppConfig>),
@@ -44,9 +55,13 @@ pub enum Message {
     PluginReady(&'static str),
 
     // ── 扩展（未来插件用） ──
-    Custom { kind: String, payload: String },
+    Custom {
+        kind: String,
+        payload: String,
+    },
 }
 
+#[derive(Clone)]
 pub enum PlayerCommand {
     Play,
     Pause,
@@ -66,6 +81,7 @@ pub struct PlayerStatusData {
     pub current_video: Option<String>,
 }
 
+#[derive(Clone)]
 pub enum WifiCommand {
     Scan,
     Connect { ssid: String, password: String },