Feat: Fold hostname into client ID and log clone-ID collisions

Cloned miniPC images share the same MachineGuid, so their client_id
collides and only one host appears in the list. Fold the hostname into
the V2 client-ID hash so hosts with distinct names no longer collide.
Already-persisted client IDs are unchanged: they recompute only after
the settings/client_id registry value is cleared.

Server side, when a login reuses an existing client_id but the hostname,
IP, or username differs, emit a WARN diagnostic before assigning the
connection to the standby list. Observation-only, no behavior change.

Co-Authored-By: deepseek-v4-pro

client/LoginServer.cpp

@@ -412,13 +412,13 @@ LOGIN_INFOR GetLoginInfo(DWORD dwSpeed, CONNECT_ADDRESS& conn, const std::string
     sprintf(cpuInfo, "%dMHz", dwCPUMHz);
     std::string clientID = cfg.GetStr("settings", "client_id");
     if (clientID.empty()) {
-        // V2 ID 算法：MachineGuid + 归一化路径
-        //   - 同机同程序路径永远同 ID（不依赖 IP/PCName/OS/CPU 漂移）
-        //   - 局域网多机即便同镜像（sysprep 会让 MachineGuid 各不同）也不撞库
+        // V2 ID 算法：MachineGuid + 主机名 + 归一化路径
+        //   - 主机名兜底区分同镜像克隆机：MachineGuid 相同、路径相同仍能靠主机名区分。
+        //   - 代价：改名会让 client_id 变化，丢该主机的备注/授权/历史；主机名非硬件唯一，重名仍撞。
         // MachineGuid 读取失败的极端情况退化到老算法，保兼容。
         std::string machineGuid = GetMachineGuidWindows();
         if (!machineGuid.empty()) {
-            conn.clientID = CalcalateIDv2(machineGuid, NormalizeExePathLower(buf), isAuth);
+            conn.clientID = CalcalateIDv2(machineGuid + "|" + szPCName, NormalizeExePathLower(buf), isAuth);
         } else {
             Mprintf("WARN: MachineGuid 读取失败，回退到老 ID 算法\n");
             conn.clientID = CalcalateID({ pubIP, szPCName, LoginInfor.OsVerInfoEx, cpuInfo, buf });