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

docker/build.gradle

@@ -21,6 +21,7 @@ dependencies {
     docker project(path: ':rbcs-cli', configuration: 'release')
     docker project(path: ':rbcs-server-memcache', configuration: 'release')
     docker project(path: ':rbcs-server-redis', configuration: 'release')
+    docker project(path: ':rbcs-server-otel', configuration: 'release')
 }
 
 Provider<Task> cleanTaskProvider = tasks.named(BasePlugin.CLEAN_TASK_NAME) {}