refactor: introduce plugin_ids constants, replace hardcoded plugin ID strings

src/core/dispatch.rs

@@ -1,4 +1,5 @@
 use crate::core::message::{Destination, Envelope, Message, PlayerCommand, WifiCommand};
+use crate::core::plugin_ids;
 
 /// 命令解析结果
 pub struct DispatchResult {
@@ -137,7 +138,7 @@ fn ok_video(from: &str, message: Message) -> Result<DispatchResult, String> {
     Ok(DispatchResult {
         envelope: Envelope {
             from: from.to_string(),
-            to: Destination::Plugin("video".to_string()),
+            to: Destination::Plugin(plugin_ids::VIDEO.to_string()),
             message,
         },
     })
@@ -147,7 +148,7 @@ fn ok_wifi(from: &str, message: Message) -> Result<DispatchResult, String> {
     Ok(DispatchResult {
         envelope: Envelope {
             from: from.to_string(),
-            to: Destination::Plugin("wifi".to_string()),
+            to: Destination::Plugin(plugin_ids::WIFI.to_string()),
             message,
         },
     })