feat(activity): 新增 BaseActivity 沉浸式基类和 HomeActivity 首页，统一 Activity 继承关系

- 新增 BaseActivity：继承 ComponentActivity，隐藏状态栏和导航栏，底部上滑可临时唤出导航栏
- 新增 HomeActivity（XML 版本）及对应布局 activity_home.xml，作为应用启动入口
- GoodsListActivity、FoodCollectionActivity、LocalImagePreviewActivity、PurchaseOrderActivity 统一改为继承 BaseActivity
- 更新 AndroidManifest.xml：HomeActivity 注册为启动入口

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

app/src/main/java/com/sw/inbound/activity/PurchaseOrderActivity.kt

@@ -2,7 +2,7 @@ package com.sw.inbound.activity
 
 import android.annotation.SuppressLint
 import android.os.Bundle
-import androidx.activity.ComponentActivity
+import com.sw.inbound.base.BaseActivity
 import androidx.activity.viewModels
 import androidx.compose.runtime.collectAsState
 import androidx.lifecycle.lifecycleScope
@@ -24,7 +24,7 @@ import kotlinx.coroutines.launch
  * 采购单列表
  */
 @AndroidEntryPoint
-class PurchaseOrderActivity : ComponentActivity() {
+class PurchaseOrderActivity : BaseActivity() {
 
     private var list = mutableListOf<SupplierInfo>()
     private val adapter by lazy {