feat: add config option to override user agent

Author: drdmitry

src/client.ts

@@ -58,6 +58,7 @@ export class ConversionToolsClient {
       maxPollingInterval: config.maxPollingInterval || 30000,
       pollingBackoff: config.pollingBackoff || 1.5,
       webhookUrl: config.webhookUrl,
+      userAgent: config.userAgent || `conversiontools-node/${VERSION}`,
       onUploadProgress: config.onUploadProgress,
       onDownloadProgress: config.onDownloadProgress,
       onConversionProgress: config.onConversionProgress,
@@ -71,7 +72,7 @@ export class ConversionToolsClient {
       retries: this.config.retries,
       retryDelay: this.config.retryDelay,
       retryableStatuses: this.config.retryableStatuses,
-      userAgent: `conversiontools-node/${VERSION}`,
+      userAgent: this.config.userAgent,
     });
 
     // Initialize API clients

src/types/config.ts

@@ -37,6 +37,9 @@ export interface ConversionToolsConfig {
   /** Webhook URL for task completion notifications */
   webhookUrl?: string;
 
+  /** UserAgent string for HTTP requests */
+  userAgent?: string;
+
   /** Upload progress callback */
   onUploadProgress?: (progress: ProgressEvent) => void;