fix(core): improve SmartPdf lifecycle management and update dependencies

ts/provider.ollama.ts

@@ -24,6 +24,7 @@ export class OllamaProvider extends MultiModalModel {
   }
 
   async start() {
+    await super.start();
     // Verify Ollama is running
     try {
       const response = await fetch(`${this.baseUrl}/api/tags`);
@@ -35,7 +36,9 @@ export class OllamaProvider extends MultiModalModel {
     }
   }
 
-  async stop() {}
+  async stop() {
+    await super.stop();
+  }
 
   public async chatStream(input: ReadableStream<Uint8Array>): Promise<ReadableStream<string>> {
     // Create a TextDecoder to handle incoming chunks
@@ -205,11 +208,10 @@ export class OllamaProvider extends MultiModalModel {
     messageHistory: ChatMessage[];
   }): Promise<{ message: any }> {
     // Convert PDF documents to images using SmartPDF
-    const smartpdfInstance = new plugins.smartpdf.SmartPdf();
     let documentImageBytesArray: Uint8Array[] = [];
 
     for (const pdfDocument of optionsArg.pdfDocuments) {
-      const documentImageArray = await smartpdfInstance.convertPDFToPngBytes(pdfDocument);
+      const documentImageArray = await this.smartpdfInstance.convertPDFToPngBytes(pdfDocument);
       documentImageBytesArray = documentImageBytesArray.concat(documentImageArray);
     }