feat: add MaintenanceTask entity

module-mdm/src/main/java/com/ether/pms/mdm/entity/MaintenanceTask.java

@@ -0,0 +1,95 @@
+package com.ether.pms.mdm.entity;
+
+import jakarta.persistence.*;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Entity
+@Table(name = "ops_maintenance_task")
+@Data
+public class MaintenanceTask {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @Column(name = "project_id", nullable = false)
+    private UUID projectId;
+
+    @Column(name = "task_code", nullable = false, unique = true)
+    private String taskCode;
+
+    @Column(name = "plan_id")
+    private UUID planId;
+
+    @Column(name = "equipment_id")
+    private UUID equipmentId;
+
+    @Column(name = "task_type")
+    @Enumerated(EnumType.STRING)
+    private TaskType taskType = TaskType.PREVENTIVE;
+
+    public enum TaskType {
+        PREVENTIVE,   // 预防性维护
+        CORRECTIVE    // 纠正性维护
+    }
+
+    @Column(name = "trigger_type")
+    @Enumerated(EnumType.STRING)
+    private MaintenancePlan.TriggerType triggerType;
+
+    @Column(name = "maintenance_items", columnDefinition = "TEXT")
+    private String maintenanceItems;
+
+    @Column(nullable = false)
+    @Enumerated(EnumType.STRING)
+    private Status status = Status.PENDING;
+
+    public enum Status {
+        PENDING,      // 待接受
+        ACCEPTED,     // 已接受
+        IN_PROGRESS,  // 执行中
+        COMPLETED,    // 已完成
+        CANCELLED     // 已取消
+    }
+
+    @Column(name = "assigned_to")
+    private UUID assignedTo;
+
+    @Column(name = "scheduled_date")
+    private LocalDateTime scheduledDate;
+
+    @Column(name = "actual_start_date")
+    private LocalDateTime actualStartDate;
+
+    @Column(name = "actual_end_date")
+    private LocalDateTime actualEndDate;
+
+    @Column(name = "labor_hours", precision = 10, scale = 2)
+    private BigDecimal laborHours;
+
+    @Column(name = "materials_cost", precision = 12, scale = 2)
+    private BigDecimal materialsCost;
+
+    @Column(columnDefinition = "TEXT")
+    private String remarks;
+
+    @Column(name = "created_at")
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+
+    @PrePersist
+    public void prePersist() {
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    public void preUpdate() {
+        updatedAt = LocalDateTime.now();
+    }
+}