feat: 实现动态插件系统 (6阶段完成)

- 阶段1: 消息类型序列化 (Serialize/Deserialize, &'static str → String)
- 阶段2: FFI 边界类型 + Plugin SDK (plugin_abi, showen-plugin-sdk crate)
- 阶段3: PluginLoader + DynamicPlugin (libloading 动态加载 .so)
- 阶段4: 版本管理 + 错误策略 (VersionManager, PluginState, 自动回退)
- 阶段5: 远程仓库客户端 (HTTP 下载 + tar.gz 安装)
- 阶段6: 示例插件 + HTTP 管理 API + 全目录 README 文档

54/54 测试通过，0 warnings。

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

src/plugins/http/mod.rs

@@ -43,6 +43,8 @@ pub(crate) struct HttpState {
     player_status: Mutex<crate::core::message::PlayerStatusData>,
     ble_ready: AtomicBool,
     ws_events: broadcast::Sender<String>,
+    /// 动态插件管理状态（由 Custom 消息更新）
+    plugin_states: Mutex<Vec<crate::core::service_manager::PluginStateInfo>>,
 }
 
 impl HttpState {
@@ -68,6 +70,7 @@ impl HttpState {
             player_status: Mutex::new(player_status),
             ble_ready: AtomicBool::new(false),
             ws_events,
+            plugin_states: Mutex::new(Vec::new()),
         }
     }
 
@@ -179,6 +182,21 @@ impl HttpState {
             self.publish_ws(payload);
         }
     }
+
+    pub(crate) fn plugin_states(&self) -> Vec<crate::core::service_manager::PluginStateInfo> {
+        self.plugin_states
+            .lock()
+            .map(|s| s.clone())
+            .unwrap_or_default()
+    }
+
+    fn update_plugin_states(&self, json: &str) {
+        if let Ok(states) = serde_json::from_str::<Vec<crate::core::service_manager::PluginStateInfo>>(json) {
+            if let Ok(mut current) = self.plugin_states.lock() {
+                *current = states;
+            }
+        }
+    }
 }
 
 pub struct HttpPlugin {
@@ -202,21 +220,21 @@ impl Default for HttpPlugin {
 }
 
 impl Plugin for HttpPlugin {
-    fn id(&self) -> &'static str {
+    fn id(&self) -> &str {
         "http"
     }
 
     fn info(&self) -> PluginInfo {
         PluginInfo {
-            name: "HTTP API",
-            version: "0.2.0",
-            description: "Web UI + REST API (warp)",
+            name: "HTTP API".to_string(),
+            version: "0.2.0".to_string(),
+            description: "Web UI + REST API (warp)".to_string(),
             platform: Platform::Any,
         }
     }
 
-    fn dependencies(&self) -> Vec<&'static str> {
-        vec!["video"]
+    fn dependencies(&self) -> Vec<String> {
+        vec!["video".to_string()]
     }
 
     fn init(&mut self, ctx: PluginContext) -> Result<()> {
@@ -268,9 +286,9 @@ impl Plugin for HttpPlugin {
                 };
 
                 if let Err(error) = tx.send(Envelope {
-                    from: "http",
+                    from: "http".to_string(),
                     to: crate::core::message::Destination::Manager,
-                    message: Message::PluginReady("http"),
+                    message: Message::PluginReady("http".to_string()),
                 }) {
                     eprintln!("[HttpPlugin] failed to report ready state: {error}");
                 }
@@ -314,8 +332,11 @@ impl Plugin for HttpPlugin {
                     state.publish_ws(payload);
                 }
             }
-            Message::PluginReady("ble") => state.set_ble_ready(true),
+            Message::PluginReady(ref id) if id == "ble" => state.set_ble_ready(true),
             Message::Shutdown => state.set_ble_ready(false),
+            Message::Custom { ref kind, ref payload } if kind == "plugin_states" => {
+                state.update_plugin_states(payload);
+            }
             _ => {}
         }