feat: webview manager and js bridge skeleton

app/build.gradle.kts

@@ -15,6 +15,9 @@ android {
     buildTypes { release { isMinifyEnabled = false } }
     compileOptions { sourceCompatibility = JavaVersion.VERSION_17; targetCompatibility = JavaVersion.VERSION_17 }
     kotlinOptions { jvmTarget = "17" }
+    // 本地单元测试中 android.* 桩方法返回默认值（避免 Log.d 抛 "not mocked"）
+    // android.* stub methods return default values in local unit tests (avoid Log.d "not mocked")
+    testOptions { unitTests { isReturnDefaultValues = true } }
 }
 dependencies {
     implementation("androidx.core:core-ktx:1.13.1")