[AIG]Initial authentication documentation

[daisyfaithauma]

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• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[hyperlint-ai]

1 files reviewed, 2 total issue(s) found.

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Original Link	Updated Link
https://developers.cloudflare.com/ai-gateway/configuration/authentication/	https://aig-authentication.cloudflare-docs-7ou.pages.dev/ai-gateway/configuration/authentication/
https://developers.cloudflare.com/ai-gateway/get-started/	https://aig-authentication.cloudflare-docs-7ou.pages.dev/ai-gateway/get-started/
https://developers.cloudflare.com/ai-gateway/observability/logging/	https://aig-authentication.cloudflare-docs-7ou.pages.dev/ai-gateway/observability/logging/

[hyperlint-ai]

3 files reviewed, 4 total issue(s) found.

[kathayl]

oh this is something we should definitely add to changelog. @daisyfaithauma can you do this?

[kathayl]

@G4brym Two asks!

1. Can you add steps on how to add authentication using API?
2. Does authentication work if a user is not using a curl request? Can you add an example on how users can add authentication when using openai SDK or Vercel AI SDK or other library?

[G4brym]

https://developers.cloudflare.com/api/operations/aig-config-update-gateway

curl --request PUT \
  --url https://api.cloudflare.com/client/v4/accounts/account_id/ai-gateway/gateways/my-gateway \
  --header 'Authorization: Bearer{token}' \
  --header 'Content-Type: application/json' \
  --data '{
  "cache_invalidate_on_update": true,
  "cache_ttl": 0,
  "collect_logs": true,
  "logpush": true,
  "authentication": true,
  "logpush_public_key": "my-logpush-key",
  "rate_limiting_interval": 0,
  "rate_limiting_limit": 0,
  "rate_limiting_technique": "fixed"
}'

vercel sdk

import { createOpenAI } from "@ai-sdk/openai";

const openai = createOpenAI({
  baseURL: "https://gateway.ai.cloudflare.com/v1/account-id/gateway/openai",
  headers: {
    "cf-aig-token": `Bearer {token}`,
  },
});

openai sdk

import OpenAI from "openai";

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
  baseURL: "https://gateway.ai.cloudflare.com/v1/account-id/gateway/openai",
  defaultHeaders: {
    "cf-aig-token": `Bearer {token}`,
  },
});