Add four S&P'25 papers and two classic IDS papers.

[gfw-report]

This pull request adds four S&P'25 papers: https://www.ieee-security.org/TC/SP2025/program.html.

It also adds two important and classic Intrusion Detection System Evasion papers, which has served as the foundation of a brunch of censorship circumvention strategies:

• Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection
• Network Intrusion Detection: Evasion, Traffic Normalization, and End-to-End Protocol Semantics

[NullHypothesis]

Nice, thanks for this!