feat: add JWT auth token support to LLM inference activities

action/llm/client.go

@@ -57,6 +57,7 @@ type MessageInput struct {
 	Model        statemachine.ModelSpec
 	SystemPrompt string
 	Messages     []MessageParam
+	AuthToken    string // Optional JWT token for authenticated endpoints
 }
 
 // MessageParam represents a message parameter.
@@ -136,6 +137,11 @@ func (c *OpenAIClient) CreateMessage(ctx context.Context, in MessageInput) (stri
 
 	httpReq.Header.Set("Content-Type", "application/json")
 
+	// Add authentication header if token provided
+	if in.AuthToken != "" {
+		httpReq.Header.Set("Authorization", fmt.Sprintf("Bearer %s", in.AuthToken))
+	}
+
 	// Send request
 	resp, err := c.httpClient.Do(httpReq)
 	if err != nil {