feat: Add Codex CLI provider with OAuth authentication (#1273)

Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>

scripts/modules/ai-services-unified.js

@@ -41,6 +41,7 @@ import {
 	AzureProvider,
 	BedrockAIProvider,
 	ClaudeCodeProvider,
+	CodexCliProvider,
 	GeminiCliProvider,
 	GoogleAIProvider,
 	GrokCliProvider,
@@ -70,6 +71,7 @@ const PROVIDERS = {
 	azure: new AzureProvider(),
 	vertex: new VertexAIProvider(),
 	'claude-code': new ClaudeCodeProvider(),
+	'codex-cli': new CodexCliProvider(),
 	'gemini-cli': new GeminiCliProvider(),
 	'grok-cli': new GrokCliProvider()
 };