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/camera/error.go

@@ -0,0 +1,21 @@
+package camera
+
+import "math"
+
+var (
+	Err_CameraTimeout     = CameraError(math.Pow(2, 0)) // 相机超时
+	Err_CameraNotDetected = CameraError(math.Pow(2, 1)) // 未检测到目标
+	Err_CameraCommError   = CameraError(math.Pow(2, 2)) // 通信异常
+)
+
+var CameraErrorMap = map[CameraError]string{
+	Err_CameraTimeout:     "相机超时",
+	Err_CameraNotDetected: "未检测到目标",
+	Err_CameraCommError:   "通信异常",
+}
+
+type CameraError int64
+
+func (c CameraError) Error() string {
+	return CameraErrorMap[c]
+}