feat: add MCP tools registration to LLM service

- Add RegisterTools method to ILLMService interface
- Create shared MCP to eino tool converter
- Auto-register built-in uixt tools in XTDriver initialization
- Refactor MCPHost to use shared converter
- Add comprehensive test coverage for tool conversion

This enables doubao-1.5-thinking-vision-pro model to access
MCP tools through function calling mechanism.

uixt/ai/converter_test.go

@@ -0,0 +1,84 @@
+package ai
+
+import (
+	"testing"
+
+	"github.com/mark3labs/mcp-go/mcp"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConvertMCPToolToEinoToolInfo(t *testing.T) {
+	// Create a mock MCP tool
+	mcpTool := mcp.Tool{
+		Name:        "test_tool",
+		Description: "Test tool description",
+		InputSchema: mcp.ToolInputSchema{
+			Type: "object",
+			Properties: map[string]interface{}{
+				"param1": map[string]interface{}{
+					"type":        "string",
+					"description": "Test parameter 1",
+				},
+				"param2": map[string]interface{}{
+					"type":        "number",
+					"description": "Test parameter 2",
+				},
+			},
+			Required: []string{"param1"},
+		},
+	}
+
+	// Convert to eino ToolInfo using shared converter
+	einoTool := ConvertMCPToolToEinoToolInfo(mcpTool, "uixt")
+
+	// Verify the conversion
+	assert.NotNil(t, einoTool)
+	assert.Equal(t, "uixt__test_tool", einoTool.Name)
+	assert.Equal(t, "Test tool description", einoTool.Desc)
+	assert.NotNil(t, einoTool.ParamsOneOf)
+}
+
+func TestConvertMCPToolWithoutParams(t *testing.T) {
+	// Create a mock MCP tool without parameters
+	mcpTool := mcp.Tool{
+		Name:        "simple_tool",
+		Description: "Simple tool without parameters",
+		InputSchema: mcp.ToolInputSchema{
+			Type: "object",
+		},
+	}
+
+	// Convert to eino ToolInfo using shared converter
+	einoTool := ConvertMCPToolToEinoToolInfo(mcpTool, "uixt")
+
+	// Verify the conversion
+	assert.NotNil(t, einoTool)
+	assert.Equal(t, "uixt__simple_tool", einoTool.Name)
+	assert.Equal(t, "Simple tool without parameters", einoTool.Desc)
+}
+
+func TestConvertMCPToolsToEinoToolInfos(t *testing.T) {
+	// Create multiple mock MCP tools
+	mcpTools := []mcp.Tool{
+		{
+			Name:        "tool1",
+			Description: "First tool",
+			InputSchema: mcp.ToolInputSchema{Type: "object"},
+		},
+		{
+			Name:        "tool2",
+			Description: "Second tool",
+			InputSchema: mcp.ToolInputSchema{Type: "object"},
+		},
+	}
+
+	// Convert to eino ToolInfos using shared converter
+	einoTools := ConvertMCPToolsToEinoToolInfos(mcpTools, "test_server")
+
+	// Verify the conversion
+	assert.Len(t, einoTools, 2)
+	assert.Equal(t, "test_server__tool1", einoTools[0].Name)
+	assert.Equal(t, "test_server__tool2", einoTools[1].Name)
+	assert.Equal(t, "First tool", einoTools[0].Desc)
+	assert.Equal(t, "Second tool", einoTools[1].Desc)
+}