Chore(AIGW): Review entity and provider schemas

[Guaris]

Reviewed all of these, tested schemas were valid, checked i nKonnect

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-model/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-policy/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-consumer/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-consumer-group/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-model-provider/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-identity-provider/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-mcp-server/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-agent/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/entities/ai-vault/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/openai/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/azure/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/bedrock/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/gemini/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/vertex/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/anthropic/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/cohere/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/huggingface/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/llama/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/mistral/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/xai/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/dashscope/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/cerebras/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/ollama/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/databricks/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/deepseek/

• https://deploy-preview-5907--kongdeveloper.netlify.app/ai-gateway/ai-providers/vllm/

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[lena-larionova]

Whatever skill or instructions that were used to make this PR need updating.

• Don't use em dashes (or dashes in general)
• Don't use positional language like "below" and "above"

[lena-larionova]

Both this item and the note about "AI Consumer Group to reference in [access.acls]" are prerequisites. They should be grouped together. Maybe this needs to be split into a short "prerequisites" section, and then the rest can be in a section titled "Example"?

Eg

## Set up an Agent

Blurb about setting up agents.

### Prerequisites

* Before creating an AI Agent with access restrictions, create an AI Consumer Group to reference in [`access.acls`](#schema-aigateway-agent-access). 
This example references a group named `internal-teams`. See [Set up an AI Consumer Group](/ai-gateway/entities/ai-consumer-group/#set-up-an-ai-consumer-group) to create it, or substitute the name of your own AI Consumer, AI Consumer Group, or Authenticated Group in `access.acls.allow`.

* Start an A2A agent and take note of its URL.

### Example

The following example creates an `a2a` Agent that proxies traffic to an upstream A2A agent at `https://booking-agent.internal.kongair.com`, with statistics logging enabled and access restricted to the `internal-teams` Consumer Group.

Replace the placeholder upstream URL `https://booking-agent.internal.kongair.com` with the URL of your own running A2A agent in [`config.url`](#schema-aigateway-agent-config-url). Because this Agent has `type: a2a`, requests must use the A2A JSON-RPC envelope (`jsonrpc: "2.0"`, `id`, `method: "message/send"`, `params.message` with `kind` and `messageId`)—a flat `{"message": {...}}` body without that envelope is rejected by the upstream agent itself (for example, `"Invalid Request: jsonrpc must be 2.0"`), not by {{site.ai_gateway}}.