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>

externals/stb/stb_image.h

@@ -5079,7 +5079,7 @@ static void stbi__de_iphone(stbi__png *z)
 static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
 {
    stbi_uc palette[1024], pal_img_n=0;
-   stbi_uc has_trans=0, tc[3]={0};
+   stbi_uc has_trans=0, tc[4]={0};
    stbi__uint16 tc16[3];
    stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
    int first=1,k,interlace=0, color=0, is_iphone=0;
@@ -5163,7 +5163,7 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
                if (z->depth == 16) {
                   for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
                } else {
-                  for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
+                  for (k = 0; k < s->img_n && k < 4; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
                }
             }
             break;