feat(ollama): add support for base64-encoded images in chat messages and forward them to the Ollama provider

ts/abstract.classes.multimodal.ts

@@ -6,6 +6,8 @@ import * as plugins from './plugins.js';
 export interface ChatMessage {
   role: 'assistant' | 'user' | 'system';
   content: string;
+  /** Base64-encoded images for vision-capable models */
+  images?: string[];
 }
 
 /**
@@ -15,6 +17,8 @@ export interface ChatOptions {
   systemMessage: string;
   userMessage: string;
   messageHistory: ChatMessage[];
+  /** Base64-encoded images for the current message (vision-capable models) */
+  images?: string[];
 }
 
 /**