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/data_collector/oee.go

@@ -0,0 +1,9 @@
+package data_collector
+
+// TODO: OEE 计算器需要迁移到新的 ent schema（EventLog 替代 MachineStateLog）
+// 暂时保留空实现
+
+// CalculateOEE 计算 OEE（可用性 × 性能 × 质量）
+func CalculateOEE() (float64, error) {
+	return 0, nil
+}