修复发布页移动端小数输入与押金下限校验

- 哈夫币/M：移动端输入框由 type="digit" 改为 type="number"，
  与绝密KD 一致，iOS 可输入小数点（烽火等级保持取整不变）
- 押金：新增 handleDepositBlur，输入框失焦时若低于智能推荐额度
  （或为空/非法）自动补足到推荐值并提示，桌面与移动端均生效；
  提交时校验保留作兜底

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/features/seller/views/MobileSellerListingCreateView.vue

@@ -81,6 +81,7 @@ const {
   handleFireLevelInput,
   handleAcceleratedSaleRatioInput,
   useRecommendedDeposit,
+  handleDepositBlur,
   setQuantityMode,
   clampAcceleratedSaleRatioInput,
   useReferenceSaleRatio,
@@ -177,7 +178,7 @@ const screenshotGuides: Record<string, string> = {
         <van-field
           v-model="form.haf_coin_amount"
           label="哈夫币/M"
-          type="digit"
+          type="number"
           required
           placeholder="只填写仓库右上角纯币数额，总资产不计算在内；100M 写 100"
           class="publish-field"
@@ -578,6 +579,7 @@ const screenshotGuides: Record<string, string> = {
               type="number"
               inputmode="decimal"
               :placeholder="priceConfig.deposit_placeholder"
+              @blur="handleDepositBlur"
             />
             <span>元</span>
           </div>