refactor: Convert to multi-module Maven project

Author: simbo1905

.gitignore

@@ -3,3 +3,4 @@ target/
 .idea/
 
 .claude/
+.aider*

api-tracker/pom.xml

@@ -0,0 +1,25 @@
+<?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>io.github.simbo1905</groupId>
+        <artifactId>java-util-json-java21-parent</artifactId>
+        <version>0.1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>java-util-json-java21-api-tracker</artifactId>
+    <packaging>jar</packaging>
+
+    <name>API Tracker</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.github.simbo1905</groupId>
+            <artifactId>java-util-json-java21</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+</project>

api-tracker/src/main/java/io/github/simbo1905/tracker/ApiTrackerMain.java

@@ -0,0 +1,35 @@
+package io.github.simbo1905.tracker;
+
+import jdk.sandbox.java.util.json.Json;
+import jdk.sandbox.java.util.json.JsonObject;
+import jdk.sandbox.java.util.json.JsonString;
+import jdk.sandbox.java.util.json.JsonValue;
+import jdk.sandbox.java.util.json.JsonParseException;
+
+public class ApiTrackerMain {
+    public static void main(String[] args) {
+        String testJson = """
+        {
+            "module": "api-tracker",
+            "status": "ok",
+            "dependencies": [
+                "java-util-json-java21"
+            ],
+            "active": true
+        }
+        """
+;
+        System.out.println("Parsing test JSON in api-tracker module...");
+
+        try {
+            JsonValue parsedValue = Json.parse(testJson);
+            if (parsedValue instanceof JsonObject jsonObject) {
+                System.out.println("Successfully parsed JsonObject!");
+                System.out.println("Module: " + ((JsonString) jsonObject.members().get("module")).value());
+                System.out.println("Status: " + ((JsonString) jsonObject.members().get("status")).value());
+            }
+        } catch (JsonParseException e) {
+            System.err.println("Failed to parse JSON: " + e.getMessage());
+        }
+    }
+}

java-util-json-java21/pom.xml

@@ -0,0 +1,41 @@
+<?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>io.github.simbo1905</groupId>
+        <artifactId>java-util-json-java21-parent</artifactId>
+        <version>0.1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>java-util-json-java21</artifactId>
+    <packaging>jar</packaging>
+
+    <name>java.util.json Backport</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>