refactor(window): 移除会议窗口相关功能

- 删除会议窗口创建相关的常量定义
- 移除 create_meeting_window 模块及其命令注册
- 从窗口命令模块中移除会议窗口创建函数
- 删除前端调用会议窗口创建的 API 接口
- 清理画板窗口和实时字幕窗口的占位代码

src-tauri/src/window/commands.rs

@@ -1,6 +1,5 @@
 use crate::window::create_float_list_window::create_float_list_window_impl;
 use crate::window::create_main_window::create_main_window_impl;
-use crate::window::create_meeting_window::create_meeting_window_impl;
 use crate::window::create_popup_window::create_popup_window_impl;
 use crate::window::derive::TargetLocation;
 use tauri::{AppHandle, Window};
@@ -36,9 +35,3 @@ pub async fn create_popup_window(app: AppHandle, window: Window) -> Result<Strin
 pub async fn create_main_window(app: AppHandle) -> Result<String, String> {
     create_main_window_impl(&app).await.map(|_| "success".to_string())
 }
-
-/// 创建会议窗口（Tauri命令）
-#[tauri::command]
-pub async fn create_meeting_window(app: AppHandle, window_type: u8, course_id: Option<u64>) -> Result<String, String> {
-    create_meeting_window_impl(&app, window_type, course_id).await.map(|_| "success".to_string())
-}