Proxy nonProxyHosts includes literal quote characters breaking non-proxy host matching

**Affected version:** HEAD

**File:** `src/main/java/org/apache/maven/plugins/jarsigner/AbstractJarsignerMojo.java:526-531`

The `processArchive()` method wraps the `nonProxyHosts` value in literal quote characters when constructing `-J-D` arguments for the JVM:

```java
if (StringUtils.isNotEmpty(this.settings.getActiveProxy().getNonProxyHosts())) {
additionalArguments.add("-J-Dhttp.nonProxyHosts=\""
+ this.settings.getActiveProxy().getNonProxyHosts() + "\"");

additionalArguments.add("-J-Dftp.nonProxyHosts=\""
+ this.settings.getActiveProxy().getNonProxyHosts() + "\"");
}
```

These literal `\"` characters are passed to the JVM verbatim via the `-J` argument. The resulting system property value includes the quotes, e.g., `http.nonProxyHosts` would be set to `"localhost|*.example.com"` (with quotes) instead of `localhost|*.example.com`. This causes the non-proxy host matching to fail because the host patterns include quote characters.

The fix should remove the `\"` quoting around the value.

Open src/main/java/org/apache/maven/plugins/jarsigner/AbstractJarsignerMojo.java and inspect processArchive() around lines 526-531. Verify how the nonProxyHosts value becomes the -J-Dhttp.nonProxyHosts and -J-Dftp.nonProxyHosts arguments; done means the resulting system properties contain the host patterns without literal quote characters.

Written by the indexing model from the issue text.