添加换行符，让显示更直观

Demo/FFmpegApi-Demo/demo1.lua

@@ -23,7 +23,7 @@ local function convertAndPlay()
     -- ===== 3. 错误处理 / Error handling =====
     -- 网络错误 / Network error
     if not response then
-        printError("HTTP request failed: " .. (err or "unknown error"))
+        printError("\nHTTP request failed: " .. (err or "unknown error"))
         return
     end
 
@@ -34,27 +34,27 @@ local function convertAndPlay()
     -- HTTP状态码检查 / HTTP status check
     local statusCode = response.getResponseCode()
     if statusCode ~= 200 then
-        printError("API error (status "..statusCode..")")
+        printError("\nAPI error (status "..statusCode..")")
         return
     end
 
     -- ===== 4. 解析JSON / Parse JSON =====
     local responseData = textutils.unserializeJSON(responseBody)
     if not responseData then
-        printError("Invalid API response (bad JSON)")
+        printError("\nInvalid API response (bad JSON)")
         return
     end
 
     -- API业务错误 / API logic error
     if responseData.status ~= "success" then
-        printError("Conversion failed: "..(responseData.error or "no error info"))
+        printError("\nConversion failed: "..(responseData.error or "no error info"))
         return
     end
 
     -- ===== 5. 播放音频 / Play audio =====
-    print("Conversion successful! Download URL:")
+    print("\nConversion successful! Download URL:")
     print(responseData.download_url)
-    print("Playing...")
+    print("\nPlaying...")
     shell.run("speaker play "..responseData.download_url)
 end