refactor: replace skill code with skill ID across the application

- Updated skill handling to use skill IDs instead of skill codes in various components, services, and models.
- Modified tests to reflect changes in skill identification.
- Removed references to skill codes in favor of skill IDs for consistency and clarity.
- Updated localization files to remove skill code references and adjust error messages accordingly.

internal/ai/runtime/executor/service.go

@@ -213,7 +213,7 @@ func syncSkillSummaryFromCollector(summary *RunResult, collector *callbacks.Runt
 		return
 	}
 	trace := collector.Data.Skill
-	summary.SelectedSkillCode = strings.TrimSpace(trace.Code)
+	summary.SelectedSkillID = trace.ID
 	summary.SelectedSkillName = strings.TrimSpace(trace.Name)
 	summary.SkillRouteReason = strings.TrimSpace(trace.RouteReason)
 	summary.SkillRouteTrace = strings.TrimSpace(trace.RouteTrace)

internal/ai/runtime/executor/types.go

@@ -33,7 +33,7 @@ type RunResult struct {
 	RunID                 string
 	Status                string
 	ReplyText             string
-	SelectedSkillCode     string
+	SelectedSkillID       int64
 	SelectedSkillName     string
 	SkillRouteReason      string
 	SkillRouteTrace       string