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

src/main/resources/logback.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- ACMA-8/ACMA-6：logstash TCP JSON 通道保留（字段兼容现网）+ MDC traceId -->
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level [%X{traceId:-}] %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="LOGSTASH" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
+        <destination>${LOGSTASH_HOST:-127.0.0.1}:${LOGSTASH_PORT:-5044}</destination>
+        <encoder class="net.logstash.logback.encoder.LogstashEncoder">
+            <includeMdcKeyName>traceId</includeMdcKeyName>
+        </encoder>
+        <reconnectionDelay>10 seconds</reconnectionDelay>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+        <appender-ref ref="LOGSTASH"/>
+    </root>
+
+    <logger name="com.gzzn.omms.msgexchange.nextgen" level="DEBUG"/>
+</configuration>