已完成用户APP首期功能开发

交付用户端首期页面、配套接口、后台资源及测试文档。用户APP构建、静态分析和三个管理后台构建通过；完整测试仍有2项失败，后端模型注释检查未通过，详见交付记录。

backend/api/internal/logic/payment/gas_deposit.go

@@ -0,0 +1,41 @@
+// 功能描述：供气订单支付完成后原子生成正式押金事实；版本：1.0.0。
+package payment
+
+import (
+	"fmt"
+	"time"
+
+	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// CompleteGasDeposits 将下单时锁定的押金快照转为用户押金记录，重复回调不会重复入账。
+func CompleteGasDeposits(tx *gorm.DB, orderIdentity string, paidAt time.Time) error {
+	var order models.GasorderBasic
+	if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("identity = ?", orderIdentity).First(&order).Error; err != nil {
+		return err
+	}
+	var snapshots []models.GasorderDeposit
+	if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("gasorder_basic_id = ? AND deposit_status = ?", order.ID, 10).Find(&snapshots).Error; err != nil {
+		return err
+	}
+	for _, snapshot := range snapshots {
+		var existing int64
+		if err := tx.Model(&models.DepositRecord{}).Where("gasorder_id = ? AND product_info_id = ? AND status <> ?", order.ID, snapshot.ProductInfoID, 3).Count(&existing).Error; err != nil {
+			return err
+		}
+		if existing == 0 {
+			record := models.DepositRecord{Entity: models.Entity{Identity: models.NewIdentity(), Status: 1}, DepositStatus: 10,
+				DepositNo: fmt.Sprintf("DEP%s-%s", paidAt.Format("20060102150405.000000"), snapshot.Identity), UserAccountID: order.UserAccountID, ProductInfoID: snapshot.ProductInfoID,
+				PolicyID: snapshot.PolicyID, GasorderID: order.ID, Amount: snapshot.Amount, PaidAt: paidAt}
+			if err := tx.Create(&record).Error; err != nil {
+				return err
+			}
+		}
+		if err := tx.Model(&snapshot).Where("deposit_status = ?", 10).Update("deposit_status", 23).Error; err != nil {
+			return err
+		}
+	}
+	return nil
+}