feat: bind emudeck links for switch and 3ds

yuzu, eden, Ryujinx and Azahar declare the data directories their code
reads, so EmuDeck's links place their keys in bios/<emulator>/keys and
leave the 3DS NAND files it links nowhere named, not at the BIOS root.

emulators/azahar.yml

@@ -19,6 +19,9 @@ cores:
 systems:
   - nintendo-3ds
 
+standalone_directories:
+  - "$XDG_DATA_HOME/azahar-emu"
+  - "$HOME/.local/share/azahar-emu"
 data_root:
   windows:
     path: "%APPDATA%/Azahar"

emulators/eden.yml

@@ -60,6 +60,9 @@ files:
     note: "Amiibo decryption keys (two InternalKey structs, 0x50 bytes each)"
     source_ref: "src/core/hle/service/nfc/common/amiibo_crypto.cpp:281-302"
 
+standalone_directories:
+  - "$XDG_DATA_HOME/eden"
+  - "$HOME/.local/share/eden"
 data_root:
   windows:
     path: "%APPDATA%/eden"

emulators/ryujinx.yml

@@ -16,6 +16,9 @@ systems: [nintendo-switch]
 analysis_date: "2026-03-26"
 mode: standalone
 
+standalone_directories:
+  - "$XDG_CONFIG_HOME/Ryujinx"
+  - "$HOME/.config/Ryujinx"
 data_root:
   windows:
     path: "%APPDATA%/Ryujinx"

emulators/yuzu.yml

@@ -56,6 +56,9 @@ files:
     note: "Amiibo decryption keys (two InternalKey structs, 0x50 bytes each)"
     source_ref: "src/core/hle/service/nfc/common/amiibo_crypto.cpp:273-294"
 
+standalone_directories:
+  - "$XDG_DATA_HOME/yuzu"
+  - "$HOME/.local/share/yuzu"
 data_root:
   windows:
     path: "%APPDATA%/yuzu"