feat(webview): 添加 onProgressChanged 回调，支持页面加载进度监听

sdk-webview/src/main/java/com/xuqm/sdk/webview/XWebViewTypes.kt

@@ -18,6 +18,8 @@ data class XWebViewConfig(
     val onMessage: ((String) -> Unit)? = null,
     /** 页面加载失败时回调。errorCode / description / failingUrl 对应 WebViewClient.onReceivedError 参数。 */
     val onPageError: ((errorCode: Int, description: String, failingUrl: String) -> Unit)? = null,
+    /** 页面加载进度回调（0-100）。 */
+    val onProgressChanged: ((Int) -> Unit)? = null,
 )
 
 interface XWebViewController {

sdk-webview/src/main/java/com/xuqm/sdk/webview/XWebViewView.kt

@@ -548,6 +548,11 @@ fun XWebViewView(
                 }
 
                 webChromeClient = object : WebChromeClient() {
+                    override fun onProgressChanged(view: WebView?, newProgress: Int) {
+                        super.onProgressChanged(view, newProgress)
+                        mainHandler.post { config.onProgressChanged?.invoke(newProgress) }
+                    }
+
                     override fun onPermissionRequest(request: PermissionRequest) {
                         if (PermissionRequest.RESOURCE_VIDEO_CAPTURE in request.resources) {
                             if (ContextCompat.checkSelfPermission(ctx, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {