guardrails and audit logs (#595)

## Add Enterprise Guardrails and Audit Logs Features

This PR adds two new enterprise features: Guardrails for content safety and security validation, and Audit Logs for comprehensive security event tracking. It also improves documentation for these features and makes minor UI adjustments to support them.

## Changes

- Added comprehensive documentation for Guardrails with support for AWS Bedrock, Azure Content Safety, and Patronus AI
- Added detailed documentation for Audit Logs with examples of configuration, querying, and SIEM integration
- Updated the sidebar to include new enterprise feature links
- Renamed "Teams & Customers" to "Users & Groups" for better clarity
- Added placeholder UI components for the new enterprise features
- Updated BifrostRequest documentation with clearer comments
- Updated Maxim Go dependency to v0.1.13
- Added provider logos for Azure, Bedrock, Mistral, and Patronus

## Type of change

- [x] Feature
- [x] Documentation

## Affected areas

- [x] Core (Go)
- [x] UI (Next.js)
- [x] Docs

## How to test

```sh
# Core
go version
go test ./...

# UI
cd ui
pnpm i
pnpm build
```

Navigate to the new enterprise features in the UI:
1. Check the sidebar for new "Guardrails" and "Audit Logs" links
2. Verify the placeholder UI components load correctly
3. Review the documentation for the new features

## Breaking changes

- [x] No

## Related issues

Implements enterprise feature roadmap items

## Security considerations

These features enhance security by providing content safety validation and comprehensive audit logging capabilities.

## Checklist

- [x] I added/updated tests where appropriate
- [x] I updated documentation where needed
- [x] I verified builds succeed (Go and UI)

Author: akshaydeo

core/schemas/bifrost.go

@@ -14,7 +14,14 @@ const (
 
 type KeySelector func(ctx *context.Context, keys []Key, providerKey ModelProvider, model string) (Key, error)
 
+// BifrostRequest is the request struct for all bifrost requests.
 // only ONE of the following fields should be set:
+// - TextCompletionRequest
+// - ChatRequest
+// - ResponsesRequest
+// - EmbeddingRequest
+// - SpeechRequest
+// - TranscriptionRequest
 type BifrostRequest struct {
 	Provider    ModelProvider
 	Model       string

docs/docs.json

@@ -108,13 +108,15 @@
             "group": "Enterprise Features",
             "icon": "building",
             "pages": [
+              "enterprise/guardrails",              
               "enterprise/clustering",
               "enterprise/governance",
               "enterprise/mcp-with-fa",
               "enterprise/vault-support",
               "enterprise/invpc-deployments",
               "enterprise/intelligent-load-balancing",
               "enterprise/custom-plugins",
+              "enterprise/audit-logs",
               "enterprise/log-exports"
             ]
           }