0827协议修订：姿态数据2改预留 + 状态帧新增剩余发电量 + CCU地址可配置

FC协议(0827 docx)：
- 控制指令域：字节12,13/16,17由纵倾/横倾姿态数据2改为预留（编码恒0、解码忽略）
- 状态反馈域：字节147,148由预留12改为剩余发电量(MWh)，贯通JSON/网页显示
- PM→CCU链路：姿态字段4xuchar改为2xshort(数据1)，结构体大小与线上布局不变
- 同步更新：CCU转发映射、SnapshotBuilder、pCCU网页、fuelcell网页、SQLite列描述、单测/模拟器
- 修正集成测试遗留断言(20B→24B、心跳d[19]→d[23])并增强预留字节校验

CCU地址可配置：
- pPowerManger 支持 moos 配置项 ccuhost/ccuport（默认127.0.0.1:7000）
- build-board.sh 增加 --ccu-host/--ccu-port 参数

文档：FC协议文档更新为0827版，清理过期协议docx

test/pccu/pccuTest.cpp

@@ -52,8 +52,8 @@ static void testFrameLengths() {
 // 2. FC 控制指令编解码往返
 static void testFcControlRoundTrip() {
     FcControlValue v;
-    v.mode = 2; v.cmd = 2; v.outputPower = 100; v.pitch1 = 35; v.pitch2 = -21;
-    v.roll1 = -12; v.roll2 = 48;
+    v.mode = 2; v.cmd = 2; v.outputPower = 100; v.pitch1 = 35;
+    v.roll1 = -12;
     v.emergencyAllow = 0x03; v.depth = 150;
     v.supplyCmd = 1; v.reservedCmd5 = 5; v.reservedCmd6 = 6; v.heartbeat = 7;
 
@@ -64,11 +64,11 @@ static void testFcControlRoundTrip() {
     CHECK(frame[0] == 0x40 && frame[1] == 0x40);
     CHECK(frame[4] == 0x18 && frame[5] == 0x00);   // 域字节数 0x0018 小端
 
-    // 字节位置校验（数据域起点=帧头6）：姿态各 int16 小端
+    // 字节位置校验（数据域起点=帧头6）：姿态数据1 int16 小端，数据2字节预留恒0
     CHECK(frame[6 + 3] == 0x23 && frame[6 + 4] == 0x00);   // 纵倾数据1 = 35
-    CHECK(frame[6 + 5] == 0xEB && frame[6 + 6] == 0xFF);   // 纵倾数据2 = -21 (0xFFEB)
+    CHECK(frame[6 + 5] == 0x00 && frame[6 + 6] == 0x00);   // 预留（0827协议，原纵倾数据2）
     CHECK(frame[6 + 7] == 0xF4 && frame[6 + 8] == 0xFF);   // 横倾数据1 = -12 (0xFFF4)
-    CHECK(frame[6 + 9] == 0x30 && frame[6 + 10] == 0x00);  // 横倾数据2 = 48
+    CHECK(frame[6 + 9] == 0x00 && frame[6 + 10] == 0x00);  // 预留（0827协议，原横倾数据2）
 
     FcControlValue out;
     CHECK(msg.decode(frame, static_cast<void*>(&out)));
@@ -76,9 +76,7 @@ static void testFcControlRoundTrip() {
     CHECK(out.cmd == 2);
     CHECK(out.outputPower == 100);
     CHECK(out.pitch1 == 35);
-    CHECK(out.pitch2 == -21);
     CHECK(out.roll1 == -12);
-    CHECK(out.roll2 == 48);
     CHECK(out.emergencyAllow == 0x03);
     CHECK(out.depth == 150);
     CHECK(out.supplyCmd == 1);
@@ -101,7 +99,7 @@ static void testFcStatusRoundTrip() {
     v.methanol_total_use = 100;
     v.cabin_temp1 = 25; v.h2_concentration1 = 500;
     v.heartbeat = 9; v.emergency_cmd = 0x01;
-    v.reserved[0] = 0xAAAA; v.reserved[11] = 0xBBBB;
+    v.reserved[0] = 0xAAAA; v.remaining_generation = 0xBBBB;
 
     FcStatusMessage msg;
     std::vector<uint8_t> frame = msg.encode(v);
@@ -125,7 +123,7 @@ static void testFcStatusRoundTrip() {
     CHECK(out.methanol_total_use == 100);
     CHECK(out.cabin_temp1 == 25 && out.h2_concentration1 == 500);
     CHECK(out.heartbeat == 9 && out.emergency_cmd == 0x01);
-    CHECK(out.reserved[0] == 0xAAAA && out.reserved[11] == 0xBBBB);
+    CHECK(out.reserved[0] == 0xAAAA && out.remaining_generation == 0xBBBB);
 }
 
 //--------------------------------------------------------------------------