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

rbcs-server/build.gradle

@@ -13,6 +13,11 @@ dependencies {
     implementation catalog.netty.buffer
     implementation catalog.netty.transport
     implementation catalog.netty.codec.haproxy
+    compileOnly catalog.opentelemetry.netty['4']['1']
+    compileOnly catalog.opentelemetry.sdk.extension.autoconfigure
+    compileOnly catalog.opentelemetry.logback.appender['1']['0']
+    compileOnly catalog.opentelemetry.extension.trace.propagators
+    compileOnly catalog.logback.classic
 
     api project(':rbcs-common')
     api project(':rbcs-api')