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

internal/ai/runtime/registry/registry.go

@@ -60,8 +60,8 @@ func (r *Registry) Resolve(ctx Context) (*ToolSet, error) {
 		if strings.TrimSpace(resolvedMetadata.ToolName) == "" {
 			resolvedMetadata.ToolName = toolName
 		}
-		if strings.TrimSpace(resolvedMetadata.SourceType) == "" {
-			resolvedMetadata.SourceType = strings.TrimSpace(spec.SourceType)
+		if resolvedMetadata.SourceType == "" {
+			resolvedMetadata.SourceType = spec.SourceType
 		}
 		ret.StaticToolMetadata[toolName] = ToolMetadata{
 			ToolCode:   resolvedMetadata.ToolCode,

internal/ai/runtime/registry/types.go

@@ -2,6 +2,7 @@ package registry
 
 import (
 	"cs-agent/internal/models"
+	"cs-agent/internal/pkg/enums"
 	"cs-agent/internal/pkg/toolx"
 
 	einotool "github.com/cloudwego/eino/components/tool"
@@ -19,7 +20,7 @@ type ToolMetadata struct {
 	ToolCode   string
 	ServerCode string
 	ToolName   string
-	SourceType string
+	SourceType enums.ToolSourceType
 }
 
 // ToolSet 描述当前运行时可直接挂载到 ToolsNode 上的固定工具集合。