feat: scaffold Micronaut+Kotlin service per ACMA-8 v4 architecture

- 4 modules (ingress/processing/delivery/reference) + codec + infra + jobs
- Flyway V2.0.0: six aux tables (PROC_STATE/MSG_EVENT/REF_DATA/REQ_TRACK/PUMP_JOB/FLIGHT_STATE)
- Lua: snapshot_replace (atomic cover+gen-diff-delete), batch_delete (3:30 sweep)
- config: env-externalized secrets, phase A/B switch, ACMA-8 param-table defaults
- logback: logstash TCP JSON + traceId MDC
- pure-logic tests: identity (I3), schd aggregation max-by-EVENT_ID (FIX #7)
- build verified: gradle compile+test green on JDK 25 (Micronaut 5.1 requires JVM 25+)

Migrated from legacy repo subdirectory per repo-strategy decision (separate repo
per service, org convention). Refs: ACMA-9, ACMA-8 v4, ACMA-6

build.gradle.kts

@@ -0,0 +1,55 @@
+plugins {
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.micronaut.application)
+}
+
+group = "com.gzzn.omms"
+version = "2.0.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    toolchain {
+        // Micronaut 5.1 系构件要求 JVM 25+（实测依赖解析结论，修正计划的 JDK 21 口径）
+        languageVersion = JavaLanguageVersion.of(25)
+    }
+}
+
+kotlin {
+    jvmToolchain(25)
+}
+
+micronaut {
+    runtime("netty")
+    testRuntime("junit5")
+    processing {
+        incremental(true)
+        annotations("com.gzzn.omms.msgexchange.nextgen.*")
+    }
+}
+
+dependencies {
+    implementation(libs.bundles.micronaut.runtime)
+    implementation(libs.micronaut.data.jdbc)
+    implementation(libs.micronaut.jdbc.hikari)
+    implementation(libs.micronaut.flyway)
+    implementation(libs.micronaut.redis.lettuce)
+    implementation(libs.micronaut.kafka)
+    implementation(libs.micronaut.discovery.eureka)
+    implementation(libs.jackson.dataformat.xml)
+    implementation(libs.jackson.module.kotlin)
+    implementation(libs.logstash.logback.encoder)
+
+    runtimeOnly(libs.mysql.connector.j)
+    runtimeOnly("org.yaml:snakeyaml")
+
+    testImplementation(libs.junit.jupiter)
+    testImplementation("io.micronaut.test:micronaut-test-junit5")
+    testImplementation("org.jetbrains.kotlin:kotlin-test")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}