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/gas/contract_request.go

@@ -0,0 +1,47 @@
+// 功能描述：供气单位答复本人合同变更申请，不自动改动合同条款；版本：1.0.0。
+package gas
+
+import (
+	"git.apinb.com/bsm-sdk/core/errcode"
+	"git.apinb.com/bsm-sdk/core/infra"
+	"git.apinb.com/heqiapp/platforms/backend/api/internal/impl"
+	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+	"strings"
+)
+
+// ResolveContractRequest 按原合同气站锁定申请，提交处理结果后等待用户确认。
+func ResolveContractRequest(ctx *gin.Context) {
+	account, station, ok := CurrentGasAccount(ctx)
+	if !ok {
+		return
+	}
+	var request struct {
+		Result string `json:"result" binding:"required,max=2000"`
+	}
+	if ctx.ShouldBindJSON(&request) != nil || strings.TrimSpace(request.Result) == "" {
+		infra.Response.Error(ctx, errcode.ErrInvalidArgument)
+		return
+	}
+	result := strings.TrimSpace(request.Result)
+	err := impl.DBService.Transaction(func(tx *gorm.DB) error {
+		var ticket models.CsTicket
+		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("identity = ? AND gas_basic_id = ? AND gasorder_contract_id <> 0 AND category = ? AND status <> ?", ctx.Param("identity"), station.ID, "contract_change", 3).First(&ticket).Error; err != nil {
+			return err
+		}
+		if (ticket.TicketStatus == 34 || ticket.TicketStatus == 23) && ticket.Result == result {
+			return nil
+		}
+		if ticket.TicketStatus != 32 && ticket.TicketStatus != 11 {
+			return errcode.ErrInvalidArgument
+		}
+		return tx.Model(&ticket).Updates(map[string]any{"result": result, "ticket_status": 34, "operator_identity": account.Identity}).Error
+	})
+	if err != nil {
+		infra.Response.Error(ctx, err)
+		return
+	}
+	infra.Response.Success(ctx, gin.H{"updated": true})
+}