feat: 更新背景脚本和内容脚本，添加录制控制消息处理，优化录制状态检查逻辑，新增消息常量

utils/messages.tsx

@@ -0,0 +1,17 @@
+export const messages = {
+  content: {
+    from: {
+
+    },
+    to: {
+      startRecording: 'content:start-recording',
+      stopRecording: 'content:stop-recording',
+    }
+  },
+  offscreen: {
+    to: {
+      startRecording: 'offscreen:start-recording',
+      stopRecording: 'offscreen:stop-recording',
+    },
+  },
+};