fix: 修复 M2.1 骨架编译错误 (import/match/AppConfig 字段)

src/plugins/ai/mod.rs

@@ -24,7 +24,7 @@ pub mod model_manager;
 
 pub use chat::{ChatPipeline, SessionContext};
 
-use crate::core::message::{Message, StateChanged};
+use crate::core::message::Message;
 use crate::core::plugin::*;
 use anyhow::Result;
 use std::path::PathBuf;
@@ -137,7 +137,6 @@ impl Plugin for AiPlugin {
                 if new_state == "talk" || old_state == "talk" {
                     println!("[AiPlugin] 画面状态: {old_state} → {new_state}");
                 }
-                let _ = StateChanged { old_state, new_state }; // 抑制未用警告
             }
             _ => {}
         }