refactor(frontend): 移除缩放逻辑并调整SDK容器样式

将SDK容器的缩放计算逻辑移除，改为固定不缩放
调整SDK容器的CSS样式，使用绝对定位和vh单位

frontend/scripts/main.js

@@ -344,18 +344,7 @@ function calculateScale() {
     
     if (!sdkContainer) return;
     
-    const containerWidth = container.clientWidth;
-    const containerHeight = container.clientHeight;
-    
-    const sdkWidth = 1920;
-    const sdkHeight = 1080;
-    
-    const scaleX = containerWidth / sdkWidth;
-    const scaleY = containerHeight / sdkHeight;
-    const scale = Math.max(scaleX, scaleY);
-    
-    sdkContainer.style.transform = `scale(${scale})`;
-    sdkContainer.style.transformOrigin = 'center center';
+    sdkContainer.style.transform = 'none';
 }
 
 function toggleFullscreen() {