feat(borrow): 借库申请前端必填拦截与星标——申请原因、预计归还日期(长期借用除外)

- 提交前拦截：申请原因为空或(未勾长期借用且无归还日期)提示并 return
- 表单加必填星标：申请原因恒必填；预计归还日期仅在非长期借用时 required

inventory-web/src/views/borrow/apply/index.vue

@@ -412,7 +412,7 @@
             />
           </el-select>
         </el-form-item>
-        <el-form-item label="预计归还日期">
+        <el-form-item label="预计归还日期" :required="!requestIndefinite">
           <el-date-picker
               v-model="requestExpectedReturn"
               type="date"
@@ -426,12 +426,12 @@
             长期借用
           </el-checkbox>
         </el-form-item>
-        <el-form-item label="申请原因">
+        <el-form-item label="申请原因" required>
           <el-input
               v-model="requestRemark"
               type="textarea"
               :rows="3"
-              placeholder="请填写借库申请原因（选填）"
+              placeholder="请填写借库申请原因（必填）"
               maxlength="200"
               show-word-limit
           />
@@ -1102,6 +1102,17 @@ const buildRemarkWithShortage = (baseRemark: string): string => {
 }
 
 const confirmSubmitRequest = async () => {
+  // ★ 借库申请必填拦截：申请原因；预计归还日期(除非长期借用/不限归还)
+  const _reasonText = requestRemark.value.trim()
+  if (!_reasonText) {
+    ElMessage.warning('请填写借库申请原因')
+    return
+  }
+  if (!requestIndefinite.value && !requestExpectedReturn.value) {
+    ElMessage.warning('请填写预计归还日期，或勾选“长期借用(不限归还)”')
+    return
+  }
+
   requestSubmitting.value = true
   try {
     const items = validSelectedItems.value.map((item: any) => ({