Refactor H5 line management and cache handling in WebView app

- Introduced shared_preferences for initial H5 cache management.
- Added methods to clear H5 caches and probe line availability.
- Enhanced error handling for line loading and switching.
- Removed openim_common package and its configurations.
- Updated widget tests to reflect changes in H5 line handling and URL management.

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

@@ -16,6 +16,9 @@ import android.util.Base64
 import android.util.Log
 import android.view.View
 import android.view.ViewGroup
+import android.webkit.CookieManager
+import android.webkit.WebStorage
+import android.webkit.WebView
 import android.widget.FrameLayout
 import android.widget.ImageView
 import androidx.core.content.FileProvider
@@ -31,6 +34,7 @@ class MainActivity : FlutterActivity() {
     private val CHANNEL = "io.openim.flutter.openim/apk_info"
     private val SHELL_BRANDING_CHANNEL = "io.openim.flutter.im_webview_app/shell_branding"
     private val FILE_PICKER_CHANNEL = "io.openim.flutter.openim/file_picker"
+    private val H5_CACHE_CHANNEL = "io.openim.flutter.im_webview_app/h5_cache"
     private val TAG = "MainActivity"
     private val MAX_BRANDING_ICON_SIZE = 192
     private val FILE_PICKER_REQUEST_CODE = 4201
@@ -144,6 +148,36 @@ class MainActivity : FlutterActivity() {
                 }
             }
         }
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, H5_CACHE_CHANNEL).setMethodCallHandler { call, result ->
+            when (call.method) {
+                "clearAllWebsiteData" -> {
+                    try {
+                        clearAllH5WebsiteData()
+                        result.success(true)
+                    } catch (e: Exception) {
+                        result.error("CLEAR_H5_CACHE_FAILED", e.message, null)
+                    }
+                }
+                else -> {
+                    result.notImplemented()
+                }
+            }
+        }
+    }
+
+    private fun clearAllH5WebsiteData() {
+        WebStorage.getInstance().deleteAllData()
+        CookieManager.getInstance().removeAllCookies(null)
+        CookieManager.getInstance().flush()
+
+        val webView = WebView(this)
+        try {
+            webView.clearCache(true)
+            webView.clearHistory()
+            webView.clearFormData()
+        } finally {
+            webView.destroy()
+        }
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {