feat(ingress): 实现 JDBC 信箱轮询、入站持久化与对拍测试 (U05)

src/main/kotlin/com/gzzn/omms/msgexchange/processing/Identity.kt

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+package com.gzzn.omms.msgexchange.processing
+
+import com.gzzn.omms.msgexchange.config.PipelineProps
+import com.gzzn.omms.msgexchange.domain.DecodedMessage
+import java.time.LocalDate
+
+/**
+ * ACMA-8 I3：幂等键 = SNDR|TYPE|STYP|SEQN。
+ * 计算集中此处唯一入口；“是否含日边界”可配置且默认关闭（CONFIRM 矩阵 #11，
+ * SEQN 重置作用域确认前不改语义——上线后不改幂等键）。
+ */
+object Identity {
+    fun of(
+        msg: DecodedMessage,
+        includeDayBoundary: Boolean,
+        day: LocalDate = LocalDate.now(),
+    ): String {
+        val base = "${msg.meta.sndr}|${msg.meta.type}|${msg.meta.styp}|${msg.meta.seqn}"
+        return if (includeDayBoundary) "$base|${day}" else base
+    }
+
+    fun of(msg: DecodedMessage, props: PipelineProps.Identity): String =
+        of(msg, props.includeDayBoundary)
+}