feat: 添加设备IMEI和单卡ICCID查询接口

- 新增 GET /api/admin/devices/by-imei/:imei 接口，支持通过设备号查询设备详情
- 新增 GET /api/admin/iot-cards/by-iccid/:iccid 接口，支持通过ICCID查询单卡详情
- 添加对应的 Service 层方法和 Handler
- 更新 OpenAPI 文档
- 添加集成测试并修复测试环境配置（使用环境变量）
- 归档已完成的 OpenSpec 变更记录

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

internal/handler/admin/device.go

@@ -52,6 +52,20 @@ func (h *DeviceHandler) GetByID(c *fiber.Ctx) error {
 	return response.Success(c, result)
 }
 
+func (h *DeviceHandler) GetByIMEI(c *fiber.Ctx) error {
+	imei := c.Params("imei")
+	if imei == "" {
+		return errors.New(errors.CodeInvalidParam, "设备号不能为空")
+	}
+
+	result, err := h.service.GetByDeviceNo(c.UserContext(), imei)
+	if err != nil {
+		return err
+	}
+
+	return response.Success(c, result)
+}
+
 func (h *DeviceHandler) Delete(c *fiber.Ctx) error {
 	userType := middleware.GetUserTypeFromContext(c.UserContext())
 	if userType != constants.UserTypeSuperAdmin && userType != constants.UserTypePlatform {

internal/handler/admin/iot_card.go

@@ -33,6 +33,20 @@ func (h *IotCardHandler) ListStandalone(c *fiber.Ctx) error {
 	return response.SuccessWithPagination(c, result.List, result.Total, result.Page, result.PageSize)
 }
 
+func (h *IotCardHandler) GetByICCID(c *fiber.Ctx) error {
+	iccid := c.Params("iccid")
+	if iccid == "" {
+		return errors.New(errors.CodeInvalidParam, "ICCID不能为空")
+	}
+
+	result, err := h.service.GetByICCID(c.UserContext(), iccid)
+	if err != nil {
+		return err
+	}
+
+	return response.Success(c, result)
+}
+
 func (h *IotCardHandler) AllocateCards(c *fiber.Ctx) error {
 	var req dto.AllocateStandaloneCardsRequest
 	if err := c.BodyParser(&req); err != nil {