核销金额：最低 0.01 元；输入最多两位小数；低于该值会 toast 提示，无法生成核销码。

底部提示：左右留白 + 内边距，浅底圆角块，文案改为最低 0.01、余额上限、3 分钟到店出示。
新增地址：进入页会尝试定位，自动选中当前省市区（失败则保留默认郑州）；编辑地址不重定位。

apps/mini-user/src/pages/address-edit/index.tsx

@@ -5,9 +5,15 @@ import PageShell from '../../components/PageShell';
 import SubPageHeader from '../../components/SubPageHeader';
 import RegionPicker from '../../components/RegionPicker';
 import { buildAddressListUrl, readCheckoutContext } from '../../lib/checkout-nav';
-import { DEFAULT_REGION, formatRegion, type RegionSelection } from '../../lib/region-data';
+import {
+  DEFAULT_REGION,
+  REGION_ALL,
+  formatRegion,
+  type RegionSelection,
+} from '../../lib/region-data';
 import { normalizePhoneInput, validateMobilePhone } from '../../lib/phone';
 import { getStoredUserPhone, resolveDefaultUserPhone } from '../../lib/user-phone';
+import { resolveUserCity } from '../../lib/user-location';
 import { request, toast, type UserProfile } from '../../lib/api';
 
 type AddressForm = {
@@ -27,6 +33,7 @@ export default function AddressEditPage() {
   const checkoutCtx = readCheckoutContext(router.params);
   const [pickerOpen, setPickerOpen] = useState(false);
   const [saving, setSaving] = useState(false);
+  const [locating, setLocating] = useState(false);
   const [error, setError] = useState('');
   const [form, setForm] = useState<AddressForm>(() => ({
     receiverName: '',
@@ -49,6 +56,35 @@ export default function AddressEditPage() {
       .catch(() => {});
   }, [id]);
 
+  useEffect(() => {
+    if (id) return;
+    let cancelled = false;
+    setLocating(true);
+    void resolveUserCity(true)
+      .then((resolved) => {
+        if (cancelled) return;
+        const district =
+          resolved.region.district && resolved.region.district !== REGION_ALL
+            ? resolved.region.district
+            : resolved.district && resolved.district !== REGION_ALL
+              ? resolved.district
+              : DEFAULT_REGION.district;
+        setForm((prev) => ({
+          ...prev,
+          province: resolved.region.province || prev.province,
+          city: resolved.region.city || prev.city,
+          district: district || prev.district,
+        }));
+      })
+      .catch(() => {})
+      .finally(() => {
+        if (!cancelled) setLocating(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [id]);
+
   useEffect(() => {
     if (!id) return;
     request<Array<Record<string, unknown>>>('/user/addresses').then((list) => {
@@ -161,7 +197,11 @@ export default function AddressEditPage() {
             style={{ display: 'flex', alignItems: 'center' }}
             onClick={() => setPickerOpen(true)}
           >
-            <Text>{regionText || '请选择省市区'}</Text>
+            <Text>
+              {locating && !isEdit
+                ? '定位中…'
+                : regionText || '请选择省市区'}
+            </Text>
           </View>
         </View>
         <View className="address-form-field">