fix: rebuild MES as compilable go-zero+ent backend (renamed bj_power_mes), restore 3 workstation projects from pristine original, align naming; all Go projects go build clean

bj_power_mes/internal/processor/tool/interface.go

@@ -0,0 +1,20 @@
+package tool
+
+import (
+	"context"
+)
+
+// ToolCommand 手持工具命令
+type ToolCommand struct {
+	Action string         // 操作类型（SCAN/MARK）
+	JobID  int            // 关联工件 ID
+	Params map[string]any // 操作参数
+}
+
+// HandheldTool 手持工具接口
+type HandheldTool interface {
+	ID() string
+	Type() string
+	Name() string
+	Execute(ctx context.Context, cmd ToolCommand) error
+}