Refactor skill handling and improve runtime trace capabilities

- Removed the selectSkill method from prepareService and adjusted related logic in the Run method of Service.
- Updated tool catalog to parse agent allowed tool codes directly.
- Simplified Request and RunInput structures by removing unnecessary fields.
- Enhanced the RuntimeTraceCollector to manage skill activation and visibility.
- Introduced a new databaseSkillBackend to manage skill definitions and their metadata.
- Added tests for skill backend functionalities to ensure correct behavior.
- Updated various factory methods to accommodate changes in skill handling.
- Improved documentation and descriptions for better clarity.

internal/ai/application/runtime/prepare_service.go

@@ -1,14 +1,5 @@
 package runtime
 
-import (
-	"context"
-	"encoding/json"
-	"strings"
-
-	"cs-agent/internal/ai/skills"
-	"cs-agent/internal/models"
-)
-
 func newPrepareService(catalog *toolCatalog) *prepareService {
 	return &prepareService{catalog: catalog}
 }
@@ -17,28 +8,6 @@ type prepareService struct {
 	catalog *toolCatalog
 }
 
-func (s *prepareService) selectSkill(ctx context.Context, req Request) (*models.SkillDefinition, string, string, error) {
-	result, err := skills.Select(ctx, skills.RuntimeContext{
-		AIAgent:         req.AIAgent,
-		AIConfig:        req.AIConfig,
-		UserMessage:     strings.TrimSpace(req.UserMessage.Content),
-		ConversationID:  req.Conversation.ID,
-		ManualSkillCode: strings.TrimSpace(req.ManualSkillCode),
-	})
-	if err != nil {
-		return nil, "", "", err
-	}
-	if result == nil || result.Plan == nil || result.Plan.Skill == nil {
-		traceData := marshalSkillRouteTrace(result)
-		reason := ""
-		if result != nil && result.Plan != nil {
-			reason = strings.TrimSpace(result.Plan.MatchReason)
-		}
-		return nil, reason, traceData, nil
-	}
-	return result.Plan.Skill, strings.TrimSpace(result.Plan.MatchReason), marshalSkillRouteTrace(result), nil
-}
-
 func (s *prepareService) prepareToolsForRun(req *Request) error {
 	if req == nil || req.ToolSet != nil || s.catalog == nil {
 		return nil
@@ -66,22 +35,3 @@ func (s *prepareService) prepareToolsForResume(req *ResumeRequest) error {
 	}
 	return nil
 }
-
-func marshalSkillRouteTrace(result *skills.ExecutionResult) string {
-	if result == nil || result.Plan == nil || result.Plan.RouteTrace == nil {
-		return ""
-	}
-	buf, err := json.Marshal(result.Plan.RouteTrace)
-	if err != nil {
-		return ""
-	}
-	return string(buf)
-}
-
-func cloneSkillDefinition(item *models.SkillDefinition) *models.SkillDefinition {
-	if item == nil {
-		return nil
-	}
-	clone := *item
-	return &clone
-}