feat: ESPI 4.0 Schema Compliance - Phase 20: Customer with JAXB Infrastructure (#90)

Completes Phase 20 Customer schema compliance and establishes JAXB infrastructure.

JAXB Infrastructure:
- Domain-specific export services with namespace isolation
- OffsetDateTimeAdapter for unmarshalling support
- CustomerAtomEntryDto and UsageAtomEntryDto for domain isolation
- EspiNamespacePrefixMapper for namespace prefix control
- Converted all DTOs from records to classes

Phase 20 Customer Verification:
- CustomerEntity field order matches customer.xsd
- CustomerDto field order matches customer.xsd
- All embedded objects verified (Organisation, Status, Priority)
- Fixed critical Flyway migration bug (status_value index)

Testing:
- 38 tests passing (unit + integration)
- MySQL 8.0 and PostgreSQL 18 integration tests
- All embedded object persistence verified

Related to #28
Foundation for #89

Author: dfcoffin

openespi-common/pom.xml

@@ -300,17 +300,7 @@
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
         </dependency>
-        <!-- Jakarta / Jackson XML Binding Dependencies -->
-        <dependency>
-            <groupId>tools.jackson.dataformat</groupId>
-            <artifactId>jackson-dataformat-xml</artifactId>
-            <version>${jackson-bom.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>tools.jackson.module</groupId>
-            <artifactId>jackson-module-jakarta-xmlbind-annotations</artifactId>
-            <version>${jackson-bom.version}</version>
-        </dependency>
+        <!-- Jakarta JAXB XML Binding Dependencies (removed Jackson XML) -->
         <dependency>
             <groupId>jakarta.xml.bind</groupId>
             <artifactId>jakarta.xml.bind-api</artifactId>

openespi-common/src/main/java/org/greenbuttonalliance/espi/common/dto/BillingChargeSourceDto.java

@@ -20,48 +20,35 @@
 package org.greenbuttonalliance.espi.common.dto;
 
 import jakarta.xml.bind.annotation.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
 
 /**
- * BillingChargeSource DTO record for JAXB XML marshalling/unmarshalling.
+ * BillingChargeSource DTO class for JAXB XML marshalling/unmarshalling.
  * <p>
  * Information about the source of billing charge.
  * Per ESPI 4.0 XSD (espi.xsd:1628-1643), BillingChargeSource extends Object
  * and contains a single agencyName field.
  * <p>
  * Embedded within UsageSummary DTO.
  */
-@XmlAccessorType(XmlAccessType.PROPERTY)
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "BillingChargeSource", namespace = "http://naesb.org/espi", propOrder = {
     "agencyName"
 })
-public record BillingChargeSourceDto(
-    String agencyName
-) {
-
+public class BillingChargeSourceDto {
     /**
      * Name of the billing source agency.
      * Maximum length 256 characters per String256 type.
      */
     @XmlElement(name = "agencyName")
-    public String getAgencyName() {
-        return agencyName;
-    }
-
-    /**
-     * Default constructor for JAXB.
-     */
-    public BillingChargeSourceDto() {
-        this(null);
-    }
-
-    /**
-     * Constructor with agency name.
-     *
-     * @param agencyName the name of the billing source agency
-     */
-    public BillingChargeSourceDto(String agencyName) {
-        this.agencyName = agencyName;
-    }
+    private String agencyName;
 
     /**
      * Checks if this billing charge source has a value.

openespi-common/src/main/java/org/greenbuttonalliance/espi/common/dto/RationalNumberDto.java

@@ -22,31 +22,33 @@
 import jakarta.xml.bind.annotation.XmlAccessType;
 import jakarta.xml.bind.annotation.XmlAccessorType;
 import jakarta.xml.bind.annotation.XmlType;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
 import java.math.BigInteger;
 
 /**
- * RationalNumber DTO record for JAXB XML marshalling/unmarshalling.
- * 
+ * RationalNumber DTO class for JAXB XML marshalling/unmarshalling.
+ *
  * Represents a rational number with numerator and denominator components
  * as defined in the NAESB ESPI standard.
- * 
+ *
  * @author Green Button Alliance
  * @version 1.4.0
  * @since Spring Boot 3.5
  */
 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "RationalNumber", propOrder = { "numerator", "denominator" })
-public record RationalNumberDto(
-    BigInteger numerator,
-    BigInteger denominator
-) {
-    /**
-     * Default constructor for JAXB compatibility.
-     */
-    public RationalNumberDto() {
-        this(null, null);
-    }
-    
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+public class RationalNumberDto {
+    private BigInteger numerator;
+    private BigInteger denominator;
+
     /**
      * Constructor with numerator only (denominator defaults to 1).
      *

openespi-common/src/main/java/org/greenbuttonalliance/espi/common/dto/ReadingInterharmonicDto.java

@@ -22,34 +22,36 @@
 import jakarta.xml.bind.annotation.XmlAccessType;
 import jakarta.xml.bind.annotation.XmlAccessorType;
 import jakarta.xml.bind.annotation.XmlType;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
 import java.math.BigInteger;
 
 /**
- * ReadingInterharmonic DTO record for JAXB XML marshalling/unmarshalling.
- * 
+ * ReadingInterharmonic DTO class for JAXB XML marshalling/unmarshalling.
+ *
  * Represents an interharmonic measurement with numerator and denominator components
  * as defined in the NAESB ESPI standard for power quality measurements.
- * 
+ *
  * Interharmonics are sinusoidal components with frequencies that are not integer
  * multiples of the fundamental frequency. They can cause distortion in power systems.
- * 
+ *
  * @author Green Button Alliance
  * @version 1.4.0
  * @since Spring Boot 3.5
  */
 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "ReadingInterharmonic", propOrder = { "numerator", "denominator" })
-public record ReadingInterharmonicDto(
-    BigInteger numerator,
-    BigInteger denominator
-) {
-    /**
-     * Default constructor for JAXB compatibility.
-     */
-    public ReadingInterharmonicDto() {
-        this(null, null);
-    }
-    
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+public class ReadingInterharmonicDto {
+    private BigInteger numerator;
+    private BigInteger denominator;
+
     /**
      * Constructor with numerator only (denominator defaults to 1).
      *

openespi-common/src/main/java/org/greenbuttonalliance/espi/common/dto/SummaryMeasurementDto.java

@@ -20,87 +20,71 @@
 package org.greenbuttonalliance.espi.common.dto;
 
 import jakarta.xml.bind.annotation.*;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
 
 /**
- * SummaryMeasurement DTO record for JAXB XML marshalling/unmarshalling.
- * 
+ * SummaryMeasurement DTO class for JAXB XML marshalling/unmarshalling.
+ *
  * Represents an aggregated summary measurement reading used in various
  * ESPI resources like UsagePoint, UsageSummary, etc.
- * 
+ *
  * Contains value, unit of measure, power of ten multiplier, timestamp, and readingTypeRef.
- * 
+ *
  * IMPORTANT: readingTypeRef business rules per NAESB ESPI standard:
  * - If UsagePoint atom 'related' readingType href URL is present: readingTypeRef is redundant and should be null/omitted
  * - If no 'related' readingType href URL exists: readingTypeRef should default to the atom 'self' link's href URL
  */
-@XmlAccessorType(XmlAccessType.PROPERTY)
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "SummaryMeasurement", namespace = "http://naesb.org/espi", propOrder = {
     "powerOfTenMultiplier", "timeStamp", "uom", "value", "readingTypeRef"
 })
-public record SummaryMeasurementDto(
-    
-    String powerOfTenMultiplier,
-    Long timeStamp,
-    String uom,
-    Long value,
-    String readingTypeRef
-) {
-    
+public class SummaryMeasurementDto {
+
     /**
-     * Gets the power of ten multiplier for the measurement.
+     * Power of ten multiplier for the measurement.
      * Used to scale the value (e.g., "3" for kilo, "6" for mega).
      */
     @XmlElement(name = "powerOfTenMultiplier")
-    public String getPowerOfTenMultiplier() {
-        return powerOfTenMultiplier;
-    }
-    
+    private String powerOfTenMultiplier;
+
     /**
-     * Gets the timestamp when this measurement was taken.
+     * Timestamp when this measurement was taken.
      * Stored as epoch seconds (TimeType in ESPI).
      */
     @XmlElement(name = "timeStamp")
-    public Long getTimeStamp() {
-        return timeStamp;
-    }
-    
+    private Long timeStamp;
+
     /**
-     * Gets the unit of measure for this measurement.
+     * Unit of measure for this measurement.
      * Examples: "W" (watts), "V" (volts), "A" (amperes).
      */
     @XmlElement(name = "uom")
-    public String getUom() {
-        return uom;
-    }
-    
+    private String uom;
+
     /**
-     * Gets the measurement value.
+     * Measurement value.
      * Combined with powerOfTenMultiplier to get the actual value.
      */
     @XmlElement(name = "value")
-    public Long getValue() {
-        return value;
-    }
-    
+    private Long value;
+
     /**
-     * Gets the reading type reference (URI).
+     * Reading type reference (URI).
      * Extension reference to a full ReadingType resource.
-     * 
+     *
      * BUSINESS RULE: Per NAESB ESPI standard:
      * - Returns null if UsagePoint atom 'related' readingType href URL is present (redundant)
      * - Returns atom 'self' link href URL if no 'related' readingType href exists
      */
     @XmlElement(name = "readingTypeRef")
-    public String getReadingTypeRef() {
-        return readingTypeRef;
-    }
-    
-    /**
-     * Default constructor for JAXB.
-     */
-    public SummaryMeasurementDto() {
-        this(null, null, null, null, null);
-    }
+    private String readingTypeRef;
 
     /**
      * Constructor with value and unit of measure.