add modelstudio_demos package with 2 demos

[AttanWu]

📝 PR Type

• Add new sample
• Update existing sample
• Add new test cases
• Fix test failures
• Documentation/Configuration update

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📚 Description

chat demo
mcp with chat demo
all run for modelstudio deploy

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🧪 Testing Validation

[Please explain how to validate the changes:

1. How to run the added/modified test cases?
2. Is integration testing with agentscope required?
3. Has code been formatted (e.g., pre-commit)?]

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✅ Checklist

Please complete the following checks before submitting the PR:

• All sample code has been formatted with pre-commit run --all-files
• All new/modified test cases have passed (run pytest tests/)
• Test coverage has not decreased (if applicable)
• Sample code follows agentscope best practices (e.g., config management, logging)
• Related documentation in agentscope-samples has been updated (e.g., README.md)

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[AttanWu]

have fixed

[Copilot]

Pull request overview

This PR adds a new modelstudio_demos package containing two demonstration projects for deploying agents using AgentScope and Alibaba Cloud Bailian's ModelStudio platform.

Purpose: Provide starter templates for developers to quickly build and deploy agents either locally or to Alibaba Cloud Bailian's high-code platform.

Key Changes:

• Added chat_demo: A basic chat agent using AgentScope's ReActAgent with tool execution capabilities
• Added mcp_server_with_chat: An MCP (Model Context Protocol) server integrated with chat functionality using FastMCP framework

Reviewed changes

Copilot reviewed 17 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
modelstudio_demos/mcp_server_with_chat/setup.py	Package setup configuration with UUID-based naming for cloud deployment
modelstudio_demos/mcp_server_with_chat/requirements.txt	Dependencies including FastMCP, agentscope-runtime, and various tools
modelstudio_demos/mcp_server_with_chat/deploy_starter/main.py	FastAPI application integrating MCP server with chat endpoint
modelstudio_demos/mcp_server_with_chat/deploy_starter/mcp_server.py	MCP server definition with example tools (addition, search)
modelstudio_demos/mcp_server_with_chat/deploy_starter/config.yml	Configuration file for server, MCP, and deployment settings
modelstudio_demos/chat_demo/setup.py	Package setup for basic chat demo
modelstudio_demos/chat_demo/requirements.txt	Minimal dependencies for chat functionality
modelstudio_demos/chat_demo/deploy_starter/main.py	AgentScope-based chat agent with LocalDeployManager
modelstudio_demos/chat_demo/deploy_starter/config.yml	Configuration for chat demo deployment
modelstudio_demos/chat_demo/README_zh.md	Chinese documentation with setup and deployment instructions
modelstudio_demos/chat_demo/README_en.md	English documentation with setup and deployment instructions

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[rayrayraykk]

LGTM

[rayrayraykk]

@all-contributors please add @AttanWu for example, code, doc