feat(mistral): add Mistral provider with native PDF OCR and chat integration

ts/classes.conversation.ts

@@ -84,6 +84,18 @@ export class Conversation {
     return conversation;
   }
 
+  public static async createWithMistral(smartaiRefArg: SmartAi) {
+    if (!smartaiRefArg.mistralProvider) {
+      throw new Error('Mistral provider not available');
+    }
+    const conversation = new Conversation(smartaiRefArg, {
+      processFunction: async (input) => {
+        return '' // TODO implement proper streaming
+      }
+    });
+    return conversation;
+  }
+
   public static async createWithXai(smartaiRefArg: SmartAi) {
     if (!smartaiRefArg.xaiProvider) {
       throw new Error('XAI provider not available');