Add optional OpenTelemetry Netty server instrumentation

- Update lys.version to 2026.04.14

- Add optional compileOnly dependency on opentelemetry-netty-4.1 in rbcs-server

- Add runtime guard to only activate instrumentation when OTel classes are on classpath

- Insert OTel combined handler after HttpServerCodec in the Netty pipeline

- Add requires-static JPMS directives for optional module support

.gitignore

@@ -5,3 +5,8 @@
 build
 
 rbcs-cli/native-image/*.json
+
+# Ignore JDTLS files
+.classpath
+.project
+.settings