Add Firmware 20.0.0-21.0.0 IPC support and stubs

This commit implements comprehensive firmware 20.0.0 through 21.0.0
support for Citron, including:

- Updated firmware version constants to 21.0.0 in api_version.h
- Updated HID service firmware version string to 21.0.0
- Added IPC command stubs for firmware 20.0.0+ in:
  * ISystemSettingsServer (commands 263, 264, 282, 283, 289, 300, 301, 306, 307)
  * IFirmwareDebugSettingsServer (command 24)
  * IApplicationFunctions (command 330)
  * IOlscServiceForSystemService (command 914)
  * IRemoteStorageController (commands 28, 901)
  * IService (migration) (commands 2250, 2260)
  * IAudioController (command 10200)

- Created new service interfaces with proper stubs:
  * IContinuousRecorder (grcsrv) - command 5 [20.2.0+] with 0x20-byte input
  * IDownloadContext (news) - command 4 [20.0.0+]
  * INotifyService (pdm:ntfy) - commands 100, 101 [20.0.0+] returning outinterfaces

- Added all new source files to CMakeLists.txt build system
- Fixed logging tag usage (Service_Migration instead of Service_MIG)
- Added required CMIF serialization headers for proper template instantiation

All stubs return success explicitly, eliminating the need for auto-stubbing.
All implementations follow Switchbrew documentation as closely as possible.

Based on Switchbrew documentation:
- https://switchbrew.org/wiki/21.0.0
- https://switchbrew.org/wiki/20.5.0
- https://switchbrew.org/wiki/20.4.0
- https://switchbrew.org/wiki/20.3.0
- https://switchbrew.org/wiki/20.2.0
- https://switchbrew.org/wiki/20.1.5
- https://switchbrew.org/wiki/20.1.1
- https://switchbrew.org/wiki/20.1.0
- https://switchbrew.org/wiki/20.0.1
- https://switchbrew.org/wiki/20.0.0

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/core/hle/service/grc/continuous_recorder.cpp

@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/logging/log.h"
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/grc/continuous_recorder.h"
+
+namespace Service::GRC {
+
+IContinuousRecorder::IContinuousRecorder(Core::System& system_)
+    : ServiceFramework{system_, "IContinuousRecorder"} {
+    // clang-format off
+    static const FunctionInfo functions[] = {
+        {0, nullptr, "Unknown0"},
+        {1, nullptr, "Unknown1"},
+        {2, nullptr, "Unknown2"},
+        {3, nullptr, "Unknown3"},
+        {4, nullptr, "Unknown4"},
+        {5, D<&IContinuousRecorder::Unknown5>, "Unknown5"}, // [20.2.0+] Takes 0x20-byte input
+    };
+    // clang-format on
+
+    RegisterHandlers(functions);
+}
+
+IContinuousRecorder::~IContinuousRecorder() = default;
+
+Result IContinuousRecorder::Unknown5(InBuffer<BufferAttr_HipcPointer> buffer) {
+    LOG_WARNING(Service_GRC, "(STUBBED) called Unknown5 [20.2.0+], buffer_size={}", buffer.size());
+    R_SUCCEED();
+}
+
+} // namespace Service::GRC

src/core/hle/service/grc/continuous_recorder.h

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "core/hle/service/cmif_types.h"
+#include "core/hle/service/service.h"
+
+namespace Core {
+class System;
+}
+
+namespace Service::GRC {
+
+class IContinuousRecorder final : public ServiceFramework<IContinuousRecorder> {
+public:
+    explicit IContinuousRecorder(Core::System& system_);
+    ~IContinuousRecorder() override;
+
+private:
+    Result Unknown5(InBuffer<BufferAttr_HipcPointer> buffer); // [20.2.0+] Takes 0x20-byte input
+};
+
+} // namespace Service::GRC

src/core/hle/service/grc/grc.cpp

@@ -3,6 +3,8 @@
 
 #include <memory>
 
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/grc/continuous_recorder.h"
 #include "core/hle/service/grc/grc.h"
 #include "core/hle/service/server_manager.h"
 #include "core/hle/service/service.h"
@@ -11,10 +13,10 @@ namespace Service::GRC {
 
 class GRC final : public ServiceFramework<GRC> {
 public:
-    explicit GRC(Core::System& system_) : ServiceFramework{system_, "grc:c"} {
+    explicit GRC(Core::System& system_) : ServiceFramework{system_, "grc:c"}, system{system_} {
         // clang-format off
         static const FunctionInfo functions[] = {
-            {1, nullptr, "OpenContinuousRecorder"},
+            {1, D<&GRC::OpenContinuousRecorder>, "OpenContinuousRecorder"},
             {2, nullptr, "OpenGameMovieTrimmer"},
             {3, nullptr, "OpenOffscreenRecorder"},
             {101, nullptr, "CreateMovieMaker"},
@@ -24,8 +26,18 @@ public:
 
         RegisterHandlers(functions);
     }
+
+private:
+    Result OpenContinuousRecorder(Out<SharedPointer<IContinuousRecorder>> out_interface);
+    Core::System& system;
 };
 
+Result GRC::OpenContinuousRecorder(Out<SharedPointer<IContinuousRecorder>> out_interface) {
+    LOG_WARNING(Service_GRC, "(STUBBED) called");
+    *out_interface = std::make_shared<IContinuousRecorder>(system);
+    R_SUCCEED();
+}
+
 void LoopProcess(Core::System& system) {
     auto server_manager = std::make_unique<ServerManager>(system);