feat: use six-digit numeric member invite codes

web/src/mobile/views/AuthView.vue

@@ -47,7 +47,8 @@
           <n-icon :component="MailOpenOutline" />
           <input
             v-model.trim="form.referral_code"
-            maxlength="32"
+            maxlength="6"
+            inputmode="numeric"
             autocomplete="off"
             placeholder="请输入邀请码（必填）"
           />
@@ -134,8 +135,8 @@
     if (mode.value === 'register' && !/^[\p{L}\p{M}·]{1,10}$/u.test(form.username)) {
       return void (error.value = '名字须为 1 至 10 个字符，支持汉字');
     }
-    if (mode.value === 'register' && !/^[A-Za-z0-9]{1,32}$/.test(form.referral_code)) {
-      return void (error.value = '请输入有效的邀请码');
+    if (mode.value === 'register' && !/^\d{6}$/.test(form.referral_code)) {
+      return void (error.value = '请输入 6 位数字邀请码');
     }
     submitting.value = true;
     try {