chore: acquire-core migration monorepo (legacy C + Spring Boot target skeleton)

TxCore/ECPG legacy 매입·정산 C 슬라이스(빌드검증) + Spring Boot 멀티모듈 골격(mvn test green) + MIGRATION.md 전환룰 + CI(boot 빌드).

boot/modules/acquiring/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.klaro.acquirecore</groupId>
+        <artifactId>acquire-core-boot</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>acquiring</artifactId>
+    <packaging>jar</packaging>
+    <name>acquiring</name>
+    <description>매입(acquiring) 업무 모듈 — common-framework 에 의존하는 Spring Boot 앱</description>
+
+    <dependencies>
+        <!-- 2단계 의존: 공통 프레임워크가 먼저 배치되어야 한다 -->
+        <dependency>
+            <groupId>com.klaro.acquirecore</groupId>
+            <artifactId>common-framework</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

boot/modules/acquiring/src/main/java/com/klaro/acquirecore/acquiring/AcquiringApplication.java

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+package com.klaro.acquirecore.acquiring;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * 매입(acquiring) 업무 모듈 부트스트랩.
+ *
+ * <p>레거시 {@code app/online/server_main.c} (tpsvrinit 서비스 등록) 의 Spring 대체.
+ * common-framework(TxCore 대체) 패키지를 컴포넌트 스캔에 포함해 {@code MessageCodec}
+ * 등 프레임워크 빈을 함께 올린다.
+ */
+@SpringBootApplication(scanBasePackages = {
+        "com.klaro.acquirecore.acquiring",
+        "com.klaro.acquirecore.framework"
+})
+public class AcquiringApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(AcquiringApplication.class, args);
+    }
+}

boot/modules/acquiring/src/main/resources/application.yml

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+spring:
+  application:
+    name: acquiring
+  # 스켈레톤 단계에서는 데이터소스를 배선하지 않는다(스모크 테스트가 Postgres 불필요).
+  # 매입 DBIO(purchase_dbio.pgc → MyBatis/Spring Data) 이식 시 datasource 를 추가한다.
+
+logging:
+  level:
+    com.klaro.acquirecore: INFO

boot/modules/acquiring/src/test/java/com/klaro/acquirecore/acquiring/SmokeTest.java

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+package com.klaro.acquirecore.acquiring;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * 스켈레톤 스모크 테스트.
+ *
+ * <p>DB/컨텍스트 없이 순수 JUnit 으로 빌드 파이프라인(컴파일 + `mvn test`)이
+ * 초록인지만 증명한다. common-framework 이식이 진행되면 실제 유스케이스
+ * 테스트로 대체된다.
+ */
+class SmokeTest {
+
+    @Test
+    void skeletonBuilds() {
+        assertTrue(true, "Spring Boot 매입 모듈 스켈레톤이 빌드된다");
+    }
+}