chore: 初始化 common-ecommerce 多模块骨架

四个模块：core / http / testkit / lingxing。
JDK 1.8 编译，依赖版本在 parent 统一管理，
core 仅依赖 slf4j-api，保证无第三方运行时耦合。

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

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+target/
+*.class
+*.jar
+!.mvn/wrapper/maven-wrapper.jar
+
+.idea/
+*.iml
+*.ipr
+*.iws
+.vscode/
+.classpath
+.project
+.settings/
+
+*.log
+logs/
+.DS_Store
+Thumbs.db

README.md

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+# common-ecommerce
+
+多渠道电商履约对接 SDK。把亚马逊、沃尔玛、TikTok、Temu、领星聚合等渠道的商品、订单、履约、标发、面单、账单、售后统一成一套 API。
+
+## 定位
+
+纯 SDK 库，嵌入宿主（OMS）进程运行。**不访问数据库、不访问 Redis、不访问 MQ、不私起线程或定时器**。所有外部副作用通过 SPI 注入，由宿主实现。
+
+```
+① 统一入口    ChannelSdk / 各能力门面
+② 能力接口    ProductCapable / SalesOrderCapable / FulfillmentCapable / ...
+③ 平台适配    amazon-sc / walmart-sc / tiktok / temu / lingxing / ...
+④ 基础设施    HttpTransport / Signer / TokenManager / RateLimiter / SyncEngine / Idempotency
+⑤ 宿主 SPI    AccountRepository / TokenStore / SyncCursorStore / Sink / Clock / LockProvider / ...
+```
+
+## 模块
+
+| 模块 | 职责 |
+|:---|:---|
+| `common-ecommerce-core` | 领域模型、能力接口、门面、管道、SPI。**零第三方运行时依赖** |
+| `common-ecommerce-http` | HTTP 传输、签名、令牌管理、JSON 编解码 |
+| `common-ecommerce-testkit` | InMemory SPI、FakeTransport、夹具加载、断言工具 |
+| `common-ecommerce-lingxing` | 领星聚合适配器（多子平台） |
+
+## 构建
+
+```bash
+mvn clean test
+```
+
+要求 JDK 1.8、Maven 3.6+。
+
+## 设计文档
+
+- `docs/01-architecture.md` 总体设计与边界
+- `docs/02-testing.md` 测试分层与夹具约定
+
+完整规格见 OMS 侧 `cross-border-fulfillment-sdk-design.md`。

core/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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>apelet</groupId>
+        <artifactId>common-ecommerce</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>common-ecommerce-core</artifactId>
+    <description>领域模型、能力接口、门面、管道、SPI（无平台代码、无第三方运行时依赖）</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

http/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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>apelet</groupId>
+        <artifactId>common-ecommerce</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>common-ecommerce-http</artifactId>
+    <description>HTTP 传输、签名、令牌管理、JSON 编解码</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>apelet</groupId>
+            <artifactId>common-ecommerce-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

lingxing/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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>apelet</groupId>
+        <artifactId>common-ecommerce</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>common-ecommerce-lingxing</artifactId>
+    <description>领星 Lingxing 聚合适配器（多子平台）</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>apelet</groupId>
+            <artifactId>common-ecommerce-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>apelet</groupId>
+            <artifactId>common-ecommerce-http</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>apelet</groupId>
+            <artifactId>common-ecommerce-testkit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+</project>

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>apelet</groupId>
+    <artifactId>common-ecommerce</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+    <name>common-ecommerce</name>
+    <description>多渠道电商履约对接 SDK</description>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <java.version>1.8</java.version>
+
+        <okhttp.version>4.12.0</okhttp.version>
+        <jackson.version>2.13.5</jackson.version>
+        <slf4j.version>1.7.36</slf4j.version>
+        <junit.version>5.8.2</junit.version>
+    </properties>
+
+    <modules>
+        <module>core</module>
+        <module>http</module>
+        <module>testkit</module>
+        <module>lingxing</module>
+    </modules>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>apelet</groupId>
+                <artifactId>common-ecommerce-core</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>apelet</groupId>
+                <artifactId>common-ecommerce-http</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>apelet</groupId>
+                <artifactId>common-ecommerce-testkit</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+
+            <dependency>
+                <groupId>com.squareup.okhttp3</groupId>
+                <artifactId>okhttp</artifactId>
+                <version>${okhttp.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>com.fasterxml.jackson.core</groupId>
+                <artifactId>jackson-databind</artifactId>
+                <version>${jackson.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.slf4j</groupId>
+                <artifactId>slf4j-api</artifactId>
+                <version>${slf4j.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.junit.jupiter</groupId>
+                <artifactId>junit-jupiter</artifactId>
+                <version>${junit.version}</version>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.11.0</version>
+                    <configuration>
+                        <source>1.8</source>
+                        <target>1.8</target>
+                        <encoding>UTF-8</encoding>
+                    </configuration>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-surefire-plugin</artifactId>
+                    <version>2.22.2</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>

testkit/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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>apelet</groupId>
+        <artifactId>common-ecommerce</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>common-ecommerce-testkit</artifactId>
+    <description>测试口子：InMemory SPI、FakeTransport、夹具加载、断言工具</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>apelet</groupId>
+            <artifactId>common-ecommerce-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>apelet</groupId>
+            <artifactId>common-ecommerce-http</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+        </dependency>
+    </dependencies>
+</project>