[acc, ldn] Implement CreateClientProcessMonitor and stub LoadIdTokenCache changes (#2810)

- IManagerForApplication/SystemService: from 19.0.0+ LoadIdTokenCache (3) is now LoadIdTokenCacheDeprecated (3)
- IManagerForApplication/SystemService: LoadIdTokenCache (4) stubbed
- Implement CreateClientProcessMonitor to ldn:s and ldn:u
- Create new client_process_monitor.cpp/.h files
- Change non-domain (C) functions into domain (D) functions to fix crashes

Thanks to SwitchBrew documentation, fixes 'Pokemon: Legends Z-A' LDN issues.

Co-authored-by: JPikachu <jpikachu.eden@gmail.com>
Co-authored-by: unknown <sahyno1996@gmail.com>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2810
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: JPikachu <jpikachu@eden-emu.dev>
Co-committed-by: JPikachu <jpikachu@eden-emu.dev>

src/core/hle/service/ldn/ldn.cpp

@@ -1,9 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/core.h"
 #include "core/hle/service/cmif_serialization.h"
 #include "core/hle/service/ldn/ldn.h"
+#include "core/hle/service/ldn/client_process_monitor.h"
 #include "core/hle/service/ldn/monitor_service.h"
 #include "core/hle/service/ldn/sf_monitor_service.h"
 #include "core/hle/service/ldn/sf_service.h"
@@ -40,7 +44,7 @@ public:
         // clang-format off
         static const FunctionInfo functions[] = {
             {0, C<&ISystemServiceCreator::CreateSystemLocalCommunicationService>, "CreateSystemLocalCommunicationService"},
-            {1, nullptr, "CreateClientProcessMonitor"} // 18.0.0+
+            {1, C<&ISystemServiceCreator::CreateClientProcessMonitor>, "CreateClientProcessMonitor"} // 18.0.0+
         };
         // clang-format on
 
@@ -55,6 +59,14 @@ private:
         *out_interface = std::make_shared<ISystemLocalCommunicationService>(system);
         R_SUCCEED();
     }
+
+    Result CreateClientProcessMonitor(
+        OutInterface<IClientProcessMonitor> out_interface) {
+        LOG_DEBUG(Service_LDN, "called");
+
+        *out_interface = std::make_shared<IClientProcessMonitor>(system);
+        R_SUCCEED();
+    }
 };
 
 class IUserServiceCreator final : public ServiceFramework<IUserServiceCreator> {
@@ -62,8 +74,8 @@ public:
     explicit IUserServiceCreator(Core::System& system_) : ServiceFramework{system_, "ldn:u"} {
         // clang-format off
         static const FunctionInfo functions[] = {
-            {0, C<&IUserServiceCreator::CreateUserLocalCommunicationService>, "CreateUserLocalCommunicationService"},
-            {1, nullptr, "CreateClientProcessMonitor"} // 18.0.0+
+            {0, D<&IUserServiceCreator::CreateUserLocalCommunicationService>, "CreateUserLocalCommunicationService"},
+            {1, D<&IUserServiceCreator::CreateClientProcessMonitor>, "CreateClientProcessMonitor"} // 18.0.0+
         };
         // clang-format on
 
@@ -78,6 +90,14 @@ private:
         *out_interface = std::make_shared<IUserLocalCommunicationService>(system);
         R_SUCCEED();
     }
+
+    Result CreateClientProcessMonitor(
+        OutInterface<IClientProcessMonitor> out_interface) {
+        LOG_DEBUG(Service_LDN, "called");
+
+        *out_interface = std::make_shared<IClientProcessMonitor>(system);
+        R_SUCCEED();
+    }
 };
 
 class ISfServiceCreator final : public ServiceFramework<ISfServiceCreator> {