refactor(config): drop system-time defaults from domain and entry points

删除会被误用的系统时间默认值：MsgEvent.createdAt、ProcState.updatedAt、InboxPoller.pollOnce(now)、HistorySweepJob.run(now)、Identity.of(day)。Identity 的日期边界改由 MessageProcessor 按 PARAM:msgx.operation-day.zone 算出后传入（边界关闭时身份值不变）；StubProcState/StubInbox 改注入 Clock（测试可传假时钟），全部调用点显式传时间。

验证：./gradlew test 145 tests / 0 fail / 0 skipped。

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

@@ -3,6 +3,7 @@ package com.gzzn.omms.msgexchange.processing
 import com.gzzn.omms.msgexchange.codec.FlopPayload
 import com.gzzn.omms.msgexchange.codec.ScheduleBody
 import com.gzzn.omms.msgexchange.codec.XmlCodec
+import com.gzzn.omms.msgexchange.config.OperationDayProps
 import com.gzzn.omms.msgexchange.config.PipelineProps
 import com.gzzn.omms.msgexchange.domain.DecodedMessage
 import com.gzzn.omms.msgexchange.domain.ErrorClass
@@ -18,6 +19,7 @@ import jakarta.inject.Singleton
 import java.time.Clock
 import java.time.Duration
 import java.time.Instant
+import java.time.LocalDate
 import java.util.concurrent.atomic.AtomicLong
 
 /**
@@ -147,6 +149,7 @@ class MessageProcessor(
     private val procFailure: ProcFailure,
     private val props: PipelineProps,
     private val clock: Clock,
+    private val operationDayProps: OperationDayProps,
 ) {
     private val log = org.slf4j.LoggerFactory.getLogger(MessageProcessor::class.java)
 
@@ -186,7 +189,9 @@ class MessageProcessor(
 
         // I3：identity 仅首次绑定（head.identityKey == null）；FAILED 重试不重绑
         if (head.identityKey == null) {
-            val identity = Identity.of(decoded, props.identity)
+            val identity = Identity.of(
+                decoded, props.identity, LocalDate.now(clock.withZone(operationDayProps.zoneId())),
+            )
             if (!procState.tryBindIdentity(head.msgId, identity)) {
                 val owner = procState.ownerOfIdentity(identity) ?: -1L
                 log.info("duplicate-of:{} -> SKIPPED msgId={}", owner, head.msgId)