pCCU 新增真实CCU配电桥接（rcu链路原帧透传+网页显示）并适配板卡端口拓扑

- protocol/DisProtocol: 配电协议8条消息(指令0x0001~4/反馈0x0005~8, Sum8)，复用pmSysvariable结构体+static_assert核对
- ChecksumPolicy 新增 Sum8；Frame 支持 1 字节校验和
- MessageRegistry 支持 (id+帧总长) 二维查找：配电指令与PM操控指令共用id按帧长区分（帧头length字段不可信）
- LinkManager: 按实际帧长分发 + sendRaw原帧透传 + 非本协议帧头落库节流告警；UdpEndpoint sendTo 加锁
- comm/RcuLinkManager: 真实CCU链路；core/DisBridge: 配电桥接器（反馈转pPowerManger+解码显示，指令转真实CCU，0x0004仅显示不转发）
- 网页新增"真实CCU"页签全字段展示；SnapshotBuilder realCcu 节 + rcu 链路描述
- h100.moos: 端口腾挪(真实CCU固定上报5001归pCCU，pPowerManger iport=5002)，rcu_remote=192.168.0.140:7000
- 测试: pccuTest 新增配电/Sum8/长度分发/RCU注册表用例(176项)；集成测试新增桥接字节一致+不误转发用例

src/pCCU/CCU_Info.cpp

@@ -19,7 +19,9 @@ void showSynopsis() {
   blk("  It receives FC status, integrates & forwards to pPowerManger,");
   blk("  maps pPowerManger commands to FC operations, receives CAN    ");
   blk("  bus BMS battery frames via pCanBridge (CAN_0x* MOOS msgs),   ");
-  blk("  stores data in SQLite and provides a web monitoring page.    ");
+  blk("  bridges power-distribution (配电) frames between pPowerManger");
+  blk("  and a real CCU device (rcu link), stores data in SQLite and  ");
+  blk("  provides a web monitoring page.                              ");
   blk("                                                                ");
 }
 
@@ -68,6 +70,10 @@ void showExampleConfigAndExit() {
   blk("  pm_local_port  = 7000      // PM 指令接收端口                  ");
   blk("  pm_remote_ip   = 192.168.0.140 // 控制主机 IP                  ");
   blk("  pm_remote_port = 5001      // 控制主机接收端口                 ");
+  blk("  rcu_enable     = true      // 是否启用真实CCU配电桥接          ");
+  blk("  rcu_local_port = 7100      // 真实CCU 数据接收端口             ");
+  blk("  rcu_remote_ip  = 192.168.0.200 // 真实CCU IP(占位,按实际修改)  ");
+  blk("  rcu_remote_port= 7000      // 真实CCU 接收端口                 ");
   blk("  // 锂电池 BMS 走 CAN 总线（经 pCanBridge 的 CAN_0x* 透传）      ");
   blk("  dbpath         = pccu_data.db // 数据库路径                    ");
   blk("  logpath        = pCCU.log   // 日志路径                        ");
@@ -91,11 +97,13 @@ void showInterfaceAndExit() {
   blk("  CAN_0x*            = pCanBridge 透传的 CAN 帧（锂电池 BMS）   ");
   blk("  CCU_FC_LINK_STATE  = 运行状态字符串                           ");
   blk("  CCU_PM_LINK_STATE  = 运行状态字符串                           ");
+  blk("  CCU_RCU_LINK_STATE = 运行状态字符串                           ");
   blk("                                                                ");
   blk("PUBLICATIONS:                                                   ");
   blk("------------------------------------                            ");
   blk("  CCU_FC_LINK_STATE  = 运行状态字符串                           ");
   blk("  CCU_PM_LINK_STATE  = 运行状态字符串                           ");
+  blk("  CCU_RCU_LINK_STATE = 运行状态字符串                           ");
   blk("                                                                ");
   exit(0);
 }