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/routers/gas_business.go

@@ -117,6 +117,7 @@ func registerGasBusinessRoutes(group *gin.RouterGroup) {
 	ticket.GET("", gaslogic.ListTicket)
 	ticket.POST("", gaslogic.CreateTicket)
 	ticket.GET("/:identity", gaslogic.GetTicket)
+	ticket.POST("/:identity/resolve-contract-request", gaslogic.ResolveContractRequest)
 	ticket.PUT("/:identity", gaslogic.UpdateTicket)
 	ticket.PATCH("/:identity/status", gaslogic.UpdateTicketStatus)
 	ticket.DELETE("/:identity", gaslogic.ArchiveTicket)