Split up AI filtering files (#592)

* Split up AI filtering files

Create aggressive/moderate/permissive policies to allow administrators to choose their AI/LLM stance.

Aggressive policy matches existing default in Anubis.

Removes `Google-Extended` flag from `ai-robots-txt.yaml` as it doesn't exist in requests.

Rename `ai-robots-txt.yaml` to `ai-catchall.yaml` as the file is no longer a copy of the source repo/file.

* chore: spelling

* chore: fix embeds

* chore: fix data includes

* chore: fix file name typo

* chore: Ignore READMEs in configs

* chore(lib/policy/config): go tool goimports -w

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Xe Iaso <me@xeiaso.net>

data/clients/ai.yaml

@@ -0,0 +1,8 @@
+# User agents that act on behalf of humans in AI tools, e.g. searching the web.
+# Each entry should have a positive/ALLOW entry created as well, with further documentation.
+# Exceptions:
+#  - Claude-User: No published IP allowlist
+- name: "ai-clients"
+  user_agent_regex: >-
+    ChatGPT-User|Claude-User|MistralAI-User
+  action: DENY