### What problem does this PR solve?
Add MCP treamable-http transport.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Add MCP server dashboard operations.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
This is a cherry-pick from #7781 as requested.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>
### What problem does this PR solve?
Add mcp self-host mode, a complement of #7084.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
Add MCP support with a client example.
Issue link: #4344
### Type of change
- [x] New Feature (non-breaking change which adds functionality)