feat: add EU AI Act guardrail config example

Example configuration showing how to enable EU AI Act Article 5 guardrail.

litellm/proxy/example_config_yaml/guardrails_eu_ai_act.yaml

@@ -0,0 +1,21 @@
+model_list:
+  - model_name: gpt-4o-mini
+    litellm_params:
+      model: openai/gpt-4o-mini
+      api_key: os.environ/OPENAI_API_KEY
+
+guardrails:
+  - guardrail_name: "eu-ai-act-article5"
+    litellm_params:
+      guardrail: litellm_content_filter
+      mode: "pre_call"
+
+      # Load policy template
+      categories:
+        - category: "eu_ai_act_article5_prohibited_practices"
+          category_file: "policy_templates/eu_ai_act_article5.yaml"
+          enabled: true
+          action: "BLOCK"
+
+# That's it! No LLM router, no API keys, no costs.
+# This uses pure keyword-based conditional matching for zero-cost, instant detection.