feat: 配置 WebView 数据目录，优化 WebView 性能；更新 homeUrl 方法以支持更好的 URL 生成逻辑

android/app/src/main/kotlin/io/openim/flutter/openim/MainActivity.kt

@@ -13,6 +13,7 @@ import android.util.Base64
 import android.util.Log
 import android.webkit.ServiceWorkerController
 import android.webkit.WebSettings
+import android.webkit.WebView
 import androidx.core.content.FileProvider
 import io.flutter.embedding.android.FlutterActivity
 import org.conscrypt.Conscrypt
@@ -29,8 +30,10 @@ class MainActivity : FlutterActivity() {
     private val WEBVIEW_CACHE_CHANNEL = "io.openim.flutter.im_webview_app/webview_cache"
     private val TAG = "MainActivity"
     private val MAX_BRANDING_ICON_SIZE = 192
+    private val WEBVIEW_DATA_DIRECTORY_SUFFIX = "h5_shell_fresh_profile_v2"
 
     override fun onCreate(savedInstanceState: android.os.Bundle?) {
+        configureWebViewDataDirectory()
         // 华为/荣耀/OPPO 等国产设备：在任意网络请求之前同步安装 Conscrypt，修复 SSL 握手失败（无 GMS 时系统 SSL 实现不完整）
         try {
             Security.insertProviderAt(Conscrypt.newProvider(), 1)
@@ -133,6 +136,20 @@ class MainActivity : FlutterActivity() {
         }
     }
 
+    private fun configureWebViewDataDirectory() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
+            return
+        }
+
+        try {
+            WebView.setDataDirectorySuffix(WEBVIEW_DATA_DIRECTORY_SUFFIX)
+        } catch (e: IllegalStateException) {
+            Log.w(TAG, "WebView data directory already initialized: ${e.message}")
+        } catch (e: Exception) {
+            Log.w(TAG, "WebView data directory configure failed: ${e.message}")
+        }
+    }
+
     private fun readLongArgument(value: Any?): Long? {
         return when (value) {
             is Int -> value.toLong()