fix(v2): log the real error behind ONNX/engine/pipeline init failures

The controller discarded the wrapped error and showed only a generic
message. Log the actual cause (e.g. onnxruntime version mismatch) to the
console so field startup failures are diagnosable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

v2/cmd/silver-pose/main.go

@@ -85,6 +85,7 @@ func (controller *controller) run(ctx context.Context, cancel func(), runID uint
 	}()
 	runtime, err := spike.OpenRuntime(controller.config.Model.ONNXPath, controller.config.Model.ONNXRuntimeDLLPath)
 	if err != nil {
+		log.Printf("初始化 ONNX Runtime 失败：%v", err)
 		controller.window.ReportIssue("无法初始化 ONNX Runtime")
 		return
 	}
@@ -101,6 +102,7 @@ func (controller *controller) run(ctx context.Context, cancel func(), runID uint
 		SessionID:                       time.Now().UTC().Format("20060102-150405"),
 	})
 	if err != nil {
+		log.Printf("初始化摔倒事件引擎失败：%v", err)
 		runtime.Close()
 		controller.window.ReportIssue("无法初始化摔倒事件引擎")
 		return
@@ -115,6 +117,7 @@ func (controller *controller) run(ctx context.Context, cancel func(), runID uint
 		alert.NewDispatcher(controller.config.Artifacts.EventDirectory, controller.config.Source.ID), time.Now,
 	)
 	if err != nil {
+		log.Printf("启动监控管线失败：%v", err)
 		runtime.Close()
 		controller.window.ReportIssue("无法启动监控管线")
 		return