Add missing field type in task operations

[jozala]

Pull Request

Description

This change adds missing types to the field type in task operations.
Some MCP clients fail when type is missing.
One example is Home Assistant which will not work because of these.

Related Issue

None

Type of Change

• Tool functionality (new tool, tool modification)
• MCP integration improvement
• Bug fix
• Performance optimization
• Documentation update
• API enhancements
• Security improvement

MCP Server Impact

No behaviour change.

API Changes

No API change.

Checklist

• My code follows the code style of this project
• I have tested the changes
• I've verified compatibility with MCP standards
• All tool schemas are properly documented
• Service layer changes are backward compatible (or documented if breaking)
• Rate limiting and error handling tested (if applicable)
• Security considerations addressed

Testing

Run the MCP server locally with Home Assistant as a client.

Documentation Updates

None

Screenshots (if applicable)

None

Additional Notes

None