Add mcp support to chat history microservice

[dittops]

Description

This PR implements MCP (Model Context Protocol) support for the comps/chathistory microservice, enabling AI agents to discover and utilize chat history management capabilities as tools.

Problem Statement

The chathistory microservice currently lacks MCP support, preventing AI agents from discovering and utilizing chat history management capabilities as tools. This limits the microservice's integration potential within agent-based workflows where automated chat history operations (create, retrieve, update, delete conversations) would be valuable.

Changes Made

1. Core Microservice Updates

• Added ENABLE_MCP environment variable to control MCP functionality (default: false)
• Updated all three @register_microservice decorators with MCP parameters:
  • enable_mcp: Controlled by environment variable
  • mcp_func_type: Set to MCPFuncType.TOOL
  • description: Added descriptive text for AI agent discovery
• Imported required MCP constants from comps.cores.mega.constants

2. Deployment Configuration

• Docker Compose: Added ENABLE_MCP environment variable to compose.yaml
• Kubernetes: Added MCP configuration section to cpu-values.yaml

3. Testing Infrastructure

• Created test_chathistory_mcp.sh following existing MCP test patterns
• Extended validate_svc_with_mcp.py to support chathistory service validation
• Test performs full CRUD cycle: create, retrieve, and delete operations

4. Documentation

• Added comprehensive MCP section to README including:
  • Configuration instructions for Docker and Kubernetes
  • Available MCP tools description
  • AI agent usage examples
  • SSE endpoint information

MCP Tools Exposed

When ENABLE_MCP=true, the following tools are available for AI agents:

1. create_documents - Create or update chat conversation history for AI agent workflows
2. get_documents - Retrieve chat conversation history for AI agent workflows
3. delete_documents - Delete chat conversation history for AI agent workflows

Testing

• Backward compatibility verified - existing functionality unchanged when MCP disabled
• MCP validation test created following established patterns
• All three operations (create, get, delete) tested via MCP interface
• Documentation updated with clear examples

Deployment Notes

• MCP is disabled by default to maintain backward compatibility
• To enable MCP, set environment variable: ENABLE_MCP=true
• No additional dependencies or security considerations required

[letonghan]

LGTM

[joshuayao]

Hi @ZePan110 could you please help check the failure? libgl1-mesa-glx is deprecated.

[ZePan110]

Hi @ZePan110 could you please help check the failure? libgl1-mesa-glx is deprecated.

The fix for the built fail has been merged.
@dittops Please check for UT test failure.

[joshuayao]

Hi @dittops could you please check the CI failures? Thanks.