feat: add multimodal image handling with multilingual medical support

[rajantripathi]

Description

This PR adds a Multimodal Image Handling Module for AutoGen agents, addressing Issue #4708.

Features

1. Image Class - Supports file path, base64, and URL image loading
2. MultiModalMessage Class - Combines text + images with language metadata
3. MedicalImage Class - Extended for clinical imaging with modality, region, and study metadata
4. MultimodalMessageHandler - Validates, preprocesses, and routes multimodal messages

Multilingual Support

• Auto-detects language from content script (Chinese, Arabic, Cyrillic)
• Localized medical prompts in English, Chinese, Arabic, Uzbek
• Cross-references multilingual medical terminology

Usage Example

from autogen_core.multimodal_handler import MedicalImage, MultiModalMessage

# Load medical image
image = MedicalImage.from_file("chest_xray.png", language="en")
image.modality = "xray"
image.anatomical_region = "chest"

# Create multimodal message
message = MultiModalMessage(
    content="What abnormalities do you see?",
    images=[image],
    language="en"
)

# Process with handler
handler = MultimodalMessageHandler(enable_medical_mode=True)
processed = handler.preprocess_for_model(message)

Related Work

• RAGAS PR [.Net][Feature Request]: Add OpenAIAssistantAgent to connect to OpenAI Assistant #2651: fix(testset): add adapt_all_prompts() to TestsetGenerator closes #1970 vibrantlabsai/ragas#2651 (multilingual evaluation)
• Breast Cancer Multimodal AI: https://github.com/rajantripathi/Breast-Cancer-Multimodal-AI

---

Author: Dr. Rajan Prasad Tripathi | AUT AI Innovation Lab

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