fix(ai): use model.api instead of hardcoding api type in streaming functions

- anthropic.ts: use model.api instead of hardcoding 'anthropic-messages'
- openai-responses.ts: use model.api instead of hardcoding 'openai-responses'
- gitlab-duo: simplify to use actual model IDs, export MODELS array

packages/ai/src/providers/anthropic.ts

@@ -149,7 +149,7 @@ export const streamAnthropic: StreamFunction<"anthropic-messages", AnthropicOpti
 		const output: AssistantMessage = {
 			role: "assistant",
 			content: [],
-			api: "anthropic-messages" as Api,
+			api: model.api as Api,
 			provider: model.provider,
 			model: model.id,
 			usage: {

packages/ai/src/providers/openai-responses.ts

@@ -40,7 +40,7 @@ export const streamOpenAIResponses: StreamFunction<"openai-responses", OpenAIRes
 		const output: AssistantMessage = {
 			role: "assistant",
 			content: [],
-			api: "openai-responses" as Api,
+			api: model.api as Api,
 			provider: model.provider,
 			model: model.id,
 			usage: {