refactor(activity): 优化启动页跳转延迟及子设备页面稳定性，修复导航栏闪烁问题

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

app/src/main/java/com/shuwei/dish/match/base/BaseActivity.kt

@@ -1,6 +1,7 @@
 package com.shuwei.dish.match.base
 
 import android.content.Intent
+import android.content.pm.ActivityInfo
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
@@ -43,9 +44,16 @@ open class BaseActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        // 提前隐藏系统栏，避免窗口创建时导航栏闪烁
+        hideSystemBars()
+        // 主设备竖屏，子设备横屏
+        requestedOrientation = if (GlobalData.deviceRole == DeviceRole.MASTER)
+            ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+        else
+            ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
         ActivityManager.addActivity(this)
         binding = ActivityBaseBinding.inflate(layoutInflater)
-        if (this !is InitActivity) {
+        if (this !is InitActivity || GlobalData.deviceRole == DeviceRole.SLAVE) {
             binding.root.setBackgroundColor(ContextCompat.getColor(this, R.color.bg_color))
         }
         setContentView(binding.root)