feat: introduce ToolSourceType enum and refactor related code to use it

internal/ai/runtime/internal/impl/factory/tool_factory.go

@@ -8,6 +8,7 @@ import (
 	impladapter "cs-agent/internal/ai/runtime/internal/impl/adapter"
 	runtimetooling "cs-agent/internal/ai/runtime/tooling"
 	"cs-agent/internal/models"
+	"cs-agent/internal/pkg/enums"
 	"cs-agent/internal/pkg/toolx"
 
 	einotool "github.com/cloudwego/eino/components/tool"
@@ -34,7 +35,7 @@ func (f *ToolFactory) BuildMCPTools(aiAgent *models.AIAgent) ([]runtimetooling.M
 		if toolCode == "" {
 			toolCode = toolx.BuildMCPToolCode(item.ServerCode, item.ToolName)
 		}
-		if toolx.ResolveToolSourceType(toolCode) != "mcp" {
+		if toolx.ResolveToolSourceType(toolCode) != enums.ToolSourceTypeMCP {
 			continue
 		}
 		serverCode, toolName := toolx.SplitMCPToolCode(toolCode)

internal/ai/runtime/internal/impl/factory/tool_helpers.go

@@ -8,6 +8,7 @@ import (
 	"cs-agent/internal/ai/runtime/registry"
 	runtimetooling "cs-agent/internal/ai/runtime/tooling"
 	"cs-agent/internal/models"
+	"cs-agent/internal/pkg/enums"
 	"cs-agent/internal/pkg/toolx"
 )
 
@@ -37,7 +38,7 @@ func buildRuntimeTraceToolMetadata(
 			ToolCode:   strings.TrimSpace(item.ToolCode),
 			ServerCode: strings.TrimSpace(item.ServerCode),
 			ToolName:   strings.TrimSpace(item.ToolName),
-			SourceType: "mcp",
+			SourceType: enums.ToolSourceTypeMCP,
 		}
 	}
 	for modelName, metadata := range staticToolMetadata {
@@ -45,7 +46,6 @@ func buildRuntimeTraceToolMetadata(
 		metadata.ToolCode = strings.TrimSpace(metadata.ToolCode)
 		metadata.ServerCode = strings.TrimSpace(metadata.ServerCode)
 		metadata.ToolName = strings.TrimSpace(metadata.ToolName)
-		metadata.SourceType = strings.TrimSpace(metadata.SourceType)
 		if modelName == "" || metadata.ToolCode == "" {
 			continue
 		}