feat(autogen-ext): add MuAPI image and video generation tools

[Anil-matcha]

Summary

Adds MuApiImageTool and MuApiVideoTool to autogen-ext — backed by muapi.ai, a unified API for 400+ generative media models.

Location

python/packages/autogen-ext/src/autogen_ext/tools/muapi/

What this adds

• MuApiImageTool — generates images (Flux, Midjourney, GPT-4o Image, Imagen 4, Seedream, HiDream, Reve, Ideogram, Hunyuan, Wan, Qwen)
• MuApiVideoTool — generates videos (Veo3, Kling, Wan, Seedance, Runway, Pixverse, Sora, HunyuanVideo)
• Both implement BaseTool with proper component_type/component_version
• Async polling via aiohttp — handles muapi's submit→poll pattern internally
• Pydantic input/output schemas with full field documentation

Usage

from autogen_ext.tools.muapi import MuApiImageTool, MuApiVideoTool
from autogen_agentchat.agents import AssistantAgent

image_tool = MuApiImageTool(api_key="your-muapi-key")
video_tool = MuApiVideoTool(api_key="your-muapi-key")

agent = AssistantAgent(
    name="media_agent",
    model_client=model_client,
    tools=[image_tool, video_tool],
)

result = await agent.run(task="Generate a photo of a sunset over mountains using flux-schnell")

Get an API key at muapi.ai/dashboard/api-keys.

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