Fix Java 17 compilation errors from removed JDK APIs

[Copilot]

The project fails to compile on Java 17 due to two removed JDK APIs: Nashorn (removed in Java 15) and Java EE annotations (removed in Java 11).

Changes

Removed Nashorn internal API usage

• ClientVersion.java: Deleted jdk.nashorn.internal.ir.annotations.@Immutable import and annotation
• The Nashorn @Immutable annotation was for JavaScript engine internals, not general Java immutability

Added javax.annotation-api dependency

• tars-spring-cloud-starter/pom.xml: Added javax.annotation-api:1.3.2 dependency
• Required for @PostConstruct annotation used in TarsEurekaInstance.java
• Version managed via property for consistency with existing dependencies

<properties>
    <javax-annotation-api.version>1.3.2</javax-annotation-api.version>
</properties>

<dependencies>
    <dependency>
        <groupId>javax.annotation</groupId>
        <artifactId>javax.annotation-api</artifactId>
        <version>${javax-annotation-api.version}</version>
    </dependency>
</dependencies>

All 19 modules now compile successfully on Java 17.

Original prompt

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