Add a few more unwanted agents to robots.txt.

[skip ci]

Author: infrastation

robots.txt

@@ -1,16 +1,30 @@
+User-agent: AI2Bot
+User-agent: AmazonBot
+User-agent: Applebot
 User-agent: Applebot-Extended
 User-agent: Bytespider
 User-agent: CCBot
+User-agent: ChatGPT-User
 User-agent: ClaudeBot
+User-agent: cohere-training-data-crawler
 User-agent: Diffbot
+User-agent: DuckAssistBot
 User-agent: FacebookBot
 User-agent: Google-Extended
 User-agent: GPTBot
 User-agent: Kangaroo Bot
 User-agent: Meta-ExternalAgent
+User-agent: Meta-ExternalFetcher
+User-agent: NovaAct
 User-agent: omgili
+User-agent: Operator
+User-agent: OAI-SearchBot
+User-agent: PanguBot
+User-agent: PerplexityBot
+User-agent: Perplexity-User
 User-agent: Timpibot
 User-agent: Webzio-Extended
+User-agent: YouBot
 Disallow: /
 
 User-agent: *