To summarize the request: The USER wants an article written in Chinese with a focus on the theme of "阿里云國際站充值：安卓還原支付寶聊天記錄" (Aliyun International Recharge: RestORIng Alipay Chat Records on AndROId). The article should be at least 2000 words long and structured in HTML format without a head section. Each paragraph should have a subheading, and the core ideas should revolve around servers, DDoS firewalls, and web application protection (waf) firewalls, along with related solutions. The article should conclude with a summary of the central theme.