feat(points): 实现积分流水列表功能

- 后端新增 GET /api/v1/points/ledger 接口
- 前端新增积分流水列表页面
- 积分中心添加「查看流水」入口
- 重命名 AccountDeleteScreen 为 AccountDataScreen
- 流水列表支持分页加载和空状态展示

apps/lib/features/settings/presentation/widgets/settings_section_widgets.dart

@@ -445,6 +445,74 @@ class CoinPackageCard extends StatelessWidget {
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(AppRadius.xl),
       ),
+      child: Padding(
+        padding: const EdgeInsets.all(AppSpacing.lg),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        title,
+                        style: Theme.of(context).textTheme.titleMedium,
+                      ),
+                      const SizedBox(height: AppSpacing.xs),
+                      Text(
+                        l10n.settingsCoinAmount(amount),
+                        style: Theme.of(context).textTheme.bodyMedium,
+                      ),
+                    ],
+                  ),
+                ),
+                if (badge != null)
+                  Container(
+                    padding: const EdgeInsets.symmetric(
+                      horizontal: AppSpacing.sm,
+                      vertical: AppSpacing.xs,
+                    ),
+                    decoration: BoxDecoration(
+                      color: palette.historyGoldBg,
+                      borderRadius: BorderRadius.circular(AppRadius.full),
+                    ),
+                    child: Text(
+                      badge!,
+                      style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                        color: palette.historyGoldText,
+                        fontWeight: FontWeight.w700,
+                      ),
+                    ),
+                  ),
+              ],
+            ),
+            const SizedBox(height: AppSpacing.lg),
+            if (!isAvailable && unavailableMessage != null)
+              Text(
+                unavailableMessage!,
+                style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                  color: colors.error,
+                ),
+              )
+            else
+              Row(
+                children: [
+                  Text(
+                    price,
+                    style: Theme.of(
+                      context,
+                    ).textTheme.headlineMedium?.copyWith(color: colors.primary),
+                  ),
+                  const Spacer(),
+                  FilledButton(
+                    onPressed: isPurchasing || !isAvailable ? null : onPurchase,
+                    style: FilledButton.styleFrom(
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(AppRadius.full),
+                      ),
+                    ),
       child: Padding(
         padding: const EdgeInsets.all(AppSpacing.lg),
         child: Column(