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

ts/classes.smartai.ts

@@ -91,7 +91,29 @@ export class SmartAi {
     }
   }
 
-  public async stop() {}
+  public async stop() {
+    if (this.openaiProvider) {
+      await this.openaiProvider.stop();
+    }
+    if (this.anthropicProvider) {
+      await this.anthropicProvider.stop();
+    }
+    if (this.perplexityProvider) {
+      await this.perplexityProvider.stop();
+    }
+    if (this.groqProvider) {
+      await this.groqProvider.stop();
+    }
+    if (this.xaiProvider) {
+      await this.xaiProvider.stop();
+    }
+    if (this.ollamaProvider) {
+      await this.ollamaProvider.stop();
+    }
+    if (this.exoProvider) {
+      await this.exoProvider.stop();
+    }
+  }
   
   /**
    * create a new conversation