feat(line): 智电改造线路台账接入 ICC 消防探测器真实同步

- 重建 electric_line 表结构（迁移20261024_icc_line_rebuild.sql并同步db_init/db_seed）：删building_id/floor_no/location/icc_device_code占位字段，equip_id改可空，新增imei/gateway_id/type_code/type_name/fire_system_code/fire_system_name/part_unit_loop_code/channel_no/channel_sn/produce_date，gateway_id外键→electric_gateway
- 同步服务IccLineSyncService复用OAuth2真实鉴权分页拉取探测器（POST /detector/subsystem/page，pageSize=50短页停止），按line_code(detectorCode)幂等upsert写icc_sync_log；customer_id由orgCode→customer.icc_code解析、gateway_id由parentCode→electric_gateway.device_code匹配、equip_id同步不填充
- 列表接口返回gateway/type/imei等新字段，keyword检索含imei；前端台账页更新为新列（IMEI/所属网关/探测器类型/回路通道/消防系统/生产日期），保留手动同步按钮与筛选
- 更新系统设计文档electric_line表定义与spec（add-icc-line-sync）

client/src/api/device.ts

@@ -154,9 +154,6 @@ export interface ElectricLine {
 	iccDeviceCode?: string;
 	lineName?: string;
 	customerId: number;
-	buildingId?: number;
-	floorNo?: string;
-	location?: string;
 	status: number;
 	syncedAt?: string;
 	createdAt: string;
@@ -165,7 +162,19 @@ export interface ElectricLine {
 	customerName?: string;
 	equipCode?: string;
 	equipName?: string;
-	buildingName?: string;
+	// 探测器 / 网关相关字段
+	imei?: string;
+	gatewayId?: number;
+	gatewayCode?: string;
+	gatewayName?: string;
+	typeCode?: string;
+	typeName?: string;
+	fireSystemCode?: string;
+	fireSystemName?: string;
+	partUnitLoopCode?: string;
+	channelNo?: string;
+	channelSn?: string;
+	produceDate?: string;
 }
 
 export interface ElectricLineQuery {