Add 3 browser-based privacy audit tools to Browser testing

[oatjuice0]

Adding three browser-based privacy audit tools to the ### Browser testing section, alongside existing peers like EFF browser privacy test and Privacy test by Tenta:

• SnitchTest — forensic fingerprint + leak audit (18 client-side tests: WebRTC local IP, canvas/audio/WebGL hashes, TLS JA3/JA4, fonts, timezone, hardware)
• Pi-Hole Killer — adversarial ad-blocker test (103 requests × 6 pillars × 3 tiers, scores what your DNS filter or extension actually caught)
• AdBloat — ad-tech overhead benchmark (composite A-F grade based on bytes blocked, handshakes prevented, tracker payload)

All three run entirely client-side and log nothing server-side. Format matches existing - [Name](url) - Description. style. Happy to trim descriptions if they read too long.