feat(ldn): Implement missing Account and LDN services from SwitchBrew documentation

Implements 150+ missing functions across Account (acc:*) and LDN (ldn:*, lp2p:*)
services based on official SwitchBrew documentation.

Account Services (acc:su, acc:e, acc:u0, acc:u1, acc:e:u1, acc:e:u2, dauth:0):
- Add 70+ missing functions including notifiers, async operations, and OAuth procedures
- Implement GetUserRegistrationNotifier, GetUserStateChangeNotifier, GetProfileUpdateNotifier
- Add thumbnail management (LoadSaveDataThumbnail, GetSaveDataThumbnailExistence)
- Implement user management (DeleteUser, SetUserPosition, CancelUserRegistration)
- Add Nintendo Account procedures (CreateFloatingRegistrationRequest, etc.)
- Implement device migration functions (19.0.0+, 20.0.0+)
- Add debug functions for user qualification and token cache management

IManagerForApplication/SystemService (19.0.0+ compatibility):
- Rename LoadIdTokenCache (cmd 3) to LoadIdTokenCacheDeprecated
- Add new LoadIdTokenCache (cmd 4) with updated signature
- Add GetNintendoAccountUserResourceCache (cmd 136)

LDN Services (ldn:m, ldn:s, ldn:u):
- Add 80+ missing functions across all LDN interfaces
- Implement CreateClientProcessMonitor (cmd 1) for ldn:s and ldn:u (18.0.0+)
- Create IClientProcessMonitor service with RegisterClient function
- Implement IMonitorService functions (GetNetworkInfoForMonitor, GetIpv4AddressForMonitor, etc.)
- Implement ISystemLocalCommunicationService (GetState, Scan, Connect, Initialize, etc.)

LP2P Services (lp2p:app, lp2p:sys, lp2p:m):
- Implement ISfService functions (Initialize, Scan, CreateGroup, etc.)
- Implement ISfServiceMonitor (GetGroupInfo, GetMembers, AttachJoinEvent, etc.)
- Implement ISfMonitorService (GetLinkLevel)

Technical Changes:
- Change non-domain (C<>) to domain (D<>) functions in LDN to fix crashes
- Add enhanced error messaging to cmif_serialization.h for debugging
- Create client_process_monitor.cpp/.h for IClientProcessMonitor
- Add concrete async context implementations (EnsureSignedDeviceIdentifierCacheAsyncInterface, etc.)
- Add Kernel::KReadableEvent forward declarations

All functions properly stubbed with appropriate logging for future implementation.

References:
- https://switchbrew.org/wiki/Account_services
- https://switchbrew.org/wiki/LDN_services

Fixes 'Pokemon: Legends Z-A' LDN initialization crashes and improves compatibility
with games using Account and Local Network services.

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

src/core/CMakeLists.txt

@@ -748,6 +748,8 @@ add_library(core STATIC
     hle/service/kernel_helpers.h
     hle/service/lbl/lbl.cpp
     hle/service/lbl/lbl.h
+    hle/service/ldn/client_process_monitor.cpp
+    hle/service/ldn/client_process_monitor.h
     hle/service/ldn/lan_discovery.cpp
     hle/service/ldn/lan_discovery.h
     hle/service/ldn/ldn.cpp