feat(client): 购买模型/仓库切 pay v2 契约（render_type 多态 + 分金额 + 订单列表）

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-10 23:34:21 +08:00
parent 45a43c20a4
commit 179051a8fa
6 changed files with 536 additions and 8 deletions
@@ -0,0 +1,20 @@
+/// 分转元字符串，千分位分组 + 两位小数，纯整数运算（金额禁 float）。
+///
+/// 例：299900 → "2,999.00"；100 → "1.00"；0 → "0.00"；负数保留符号。
+String yuanFromMinor(int minor) {
+  final negative = minor < 0;
+  final abs = negative ? -minor : minor;
+  final yuan = abs ~/ 100;
+  final cents = abs % 100;
+
+  final yuanDigits = yuan.toString();
+  final len = yuanDigits.length;
+  final buffer = StringBuffer();
+  for (var i = 0; i < len; i++) {
+    if (i > 0 && (len - i) % 3 == 0) buffer.write(',');
+    buffer.write(yuanDigits[i]);
+  }
+
+  final centsStr = cents.toString().padLeft(2, '0');
+  return '${negative ? '-' : ''}$buffer.$centsStr';
+}