feat(wbs): complete LotField (WBS-COMP-3.4) FEFO expiry validation logic in domain field layer

src/frontend/src/components/domain-fields/LotField.vue

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+<!-- Domain Field Component Layer: LotField (WBS-COMP-3.4) -->
+<template>
+  <div class="domain-lot-field flex flex-col gap-1 border border-slate-200 p-2.5 rounded-md bg-white">
+    <div class="flex justify-between items-center text-xs">
+      <label class="font-bold text-slate-700">
+        {{ label || '로트(LOT) 번호 및 FEFO 관리' }} <span v-if="required" class="text-red-500">*</span>
+      </label>
+      <span :class="['text-[10px] px-2 py-0.5 rounded font-bold font-mono', isExpired ? 'bg-rose-100 text-rose-800' : 'bg-emerald-100 text-emerald-800']">
+        {{ isExpired ? '🚨 로트 만료' : '✓ 출고 가능 (FEFO)' }}
+      </span>
+    </div>
+
+    <div class="flex gap-2 mt-1">
+      <input
+        type="text"
+        :value="lotNumber"
+        placeholder="LOT-20260726-001"
+        :readonly="readonly"
+        :disabled="disabled"
+        class="flex-1 h-9 px-3 border border-slate-300 rounded font-mono text-xs text-slate-800 font-bold focus:ring-2 focus:ring-blue-500 focus:outline-none"
+        @input="handleLotInput"
+      />
+      <input
+        type="date"
+        :value="expirationDate"
+        :readonly="readonly"
+        :disabled="disabled"
+        class="h-9 px-2 border border-slate-300 rounded bg-slate-50 text-xs font-mono font-bold text-slate-700"
+        @change="handleDateChange"
+      />
+    </div>
+
+    <div class="flex justify-between items-center text-[11px] text-slate-500 mt-0.5">
+      <span>권장 출고 순위: <strong class="text-blue-700 font-mono">FEFO #1 (유효기간 상위)</strong></span>
+      <span>유효기간: <strong class="font-mono text-slate-700">{{ expirationDate || '미지정' }}</strong></span>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue';
+
+const props = defineProps<{
+  label?: string;
+  lotNumber: string;
+  expirationDate: string;
+  required?: boolean;
+  readonly?: boolean;
+  disabled?: boolean;
+}>();
+
+const emit = defineEmits(['update:lotNumber', 'update:expirationDate']);
+
+const isExpired = computed(() => {
+  if (!props.expirationDate) return false;
+  const exp = new Date(props.expirationDate).getTime();
+  const today = new Date().getTime();
+  return exp < today;
+});
+
+const handleLotInput = (e: Event) => {
+  emit('update:lotNumber', (e.target as HTMLInputElement).value);
+};
+
+const handleDateChange = (e: Event) => {
+  emit('update:expirationDate', (e.target as HTMLInputElement).value);
+};
+</script>