Fix CI lint: black formatting, add PromptGuardConfigModel to LitellmParams

- Reformat promptguard.py to match CI black version (parenthesization)
- Add PromptGuardConfigModel as base class of LitellmParams for proper
  Pydantic schema validation, consistent with all other guardrail vendors
- Use litellm_params.block_on_error directly (now a typed field)

litellm/proxy/guardrails/guardrail_hooks/promptguard/__init__.py

@@ -17,7 +17,7 @@ def initialize_guardrail(
     _cb = PromptGuardGuardrail(
         api_base=litellm_params.api_base,
         api_key=litellm_params.api_key,
-        block_on_error=getattr(litellm_params, "block_on_error", None),
+        block_on_error=litellm_params.block_on_error,
         guardrail_name=guardrail.get(
             "guardrail_name",
             "",

litellm/proxy/guardrails/guardrail_hooks/promptguard/promptguard.py

@@ -186,10 +186,8 @@ class PromptGuardGuardrail(CustomGuardrail):
                 if structured_messages:
                     inputs["structured_messages"] = redacted
                 if "texts" in inputs:
-                    extracted = (
-                        self._extract_texts_from_messages(
-                            redacted,
-                        )
+                    extracted = self._extract_texts_from_messages(
+                        redacted,
                     )
                     if extracted:
                         inputs["texts"] = extracted

litellm/types/guardrails.py

@@ -23,6 +23,9 @@ from litellm.types.proxy.guardrails.guardrail_hooks.akto import (
 from litellm.types.proxy.guardrails.guardrail_hooks.litellm_content_filter import (
     ContentFilterCategoryConfig,
 )
+from litellm.types.proxy.guardrails.guardrail_hooks.promptguard import (
+    PromptGuardConfigModel,
+)
 from litellm.types.proxy.guardrails.guardrail_hooks.qualifire import (
     QualifireGuardrailConfigModel,
 )
@@ -740,6 +743,7 @@ class LitellmParams(
     PillarGuardrailConfigModel,
     GraySwanGuardrailConfigModel,
     NomaGuardrailConfigModel,
+    PromptGuardConfigModel,
     ToolPermissionGuardrailConfigModel,
     ZscalerAIGuardConfigModel,
     AktoConfigModel,