refactor: remove unused tool filter middleware and helpers

- Deleted tool_filter_middleware_test.go and tool_helpers.go as they are no longer needed.
- Removed associated test cases in tool_helpers_test.go.
- Refactored knowledge retriever logic by moving it to a new file and updating imports.
- Introduced tooling package for tool result reduction logic.
- Updated traces package to include new trace types and structures.
- Adjusted executor and tool search tool to reflect new package structure.

internal/ai/runtime/tools/tool_search_tool.go

@@ -8,8 +8,8 @@ import (
 	"strings"
 
 	"agent-desk/internal/ai/mcps"
-	impladapter "agent-desk/internal/ai/runtime/internal/impl/adapter"
 	"agent-desk/internal/ai/runtime/registry"
+	"agent-desk/internal/ai/runtime/tooling"
 	"agent-desk/internal/pkg/i18nx"
 	"agent-desk/internal/pkg/toolx"
 
@@ -277,5 +277,5 @@ func cloneArguments(input map[string]any) map[string]any {
 }
 
 func buildToolCallResultSummary(result *mcps.ToolCallResult) string {
-	return impladapter.BuildReducedToolResultSummary(result)
+	return tooling.BuildReducedToolResultSummary(result)
 }