feat: 4-source verified emulator profiles (A-E cores)

33 emulator profiles created or updated with systematic
verification against libretro docs, .info, core source,
and original emulator source code.

New profiles: bsnes-jg, bsnes2014, bsnes_cplusplus98,
bsnes_hd_beta, bsnes_mercury, citra2018, citra_canary.

Key fixes:
- dosbox_svn/svn_ce: not aliases of dosbox_core (no MUNT)
- beetle_psx: alt_names renamed to aliases (field bug)
- dolphin: added 15 Realtek BT firmware for Wiimote passthrough
- dosbox_core: added CM-32LN, 13 split ROM pairs for standalone
- duckstation: type standalone+libretro, 106 BIOS verified
- snes9x/np2kai: formal aliases for alternate filenames

emulators/dolphin.yml

@@ -156,6 +156,118 @@ files:
     note: "SSL root CA certificate. Auto-extracted from IOS13 content during NAND import"
     source_ref: "Source/Core/DiscIO/NANDImporter.cpp:238"
 
+  # -- Realtek Bluetooth firmware (Wiimote passthrough) --
+  # Required for real Wiimote connectivity via USB Bluetooth adapters with Realtek chipsets.
+  # Dolphin can auto-download these from gitlab.com/kernel-firmware/linux-firmware.
+  # Placed in Load/Firmware/rtl_bt/ (standalone) or User/Load/Firmware/rtl_bt/ (libretro save dir).
+  # Each device needs _fw.bin (required) and _config.bin (optional, some devices).
+  # ref: Source/Core/Core/IOS/USB/Bluetooth/RealtekFirmwareLoader.cpp:382-425,427-481
+
+  - name: "rtl8723a_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8723a_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8723A BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:387"
+
+  - name: "rtl8723b_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8723b_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8723B BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:389"
+
+  - name: "rtl8723d_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8723d_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8723D BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:391"
+
+  - name: "rtl8761a_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8761a_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8761A BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:393"
+
+  - name: "rtl8761bu_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8761bu_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8761BU BT firmware for Wiimote passthrough (most common USB dongle)"
+    source_ref: "RealtekFirmwareLoader.cpp:395"
+
+  - name: "rtl8821a_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8821a_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8821A BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:397"
+
+  - name: "rtl8821c_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8821c_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8821C BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:399"
+
+  - name: "rtl8822b_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8822b_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8822B BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:403"
+
+  - name: "rtl8822cu_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8822cu_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8822CU BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:401"
+
+  - name: "rtl8851bu_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8851bu_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8851BU BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:405"
+
+  - name: "rtl8852au_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8852au_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8852AU BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:407"
+
+  - name: "rtl8852bu_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8852bu_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8852BU BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:409"
+
+  - name: "rtl8852cu_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8852cu_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8852CU BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:411"
+
+  - name: "rtl8852btu_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8852btu_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8852BT/8852BE-VT BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:413"
+
+  - name: "rtl8922au_fw.bin"
+    path: "Load/Firmware/rtl_bt/rtl8922au_fw.bin"
+    required: false
+    mode: standalone
+    note: "Realtek 8922AU BT firmware for Wiimote passthrough"
+    source_ref: "RealtekFirmwareLoader.cpp:415"
+
 notes:
   hle_available: true
   hle_note: >
@@ -184,3 +296,10 @@ notes:
     Wii NAND content (channels, saves, system menu) is managed by Dolphin internally.
     Users can import a BootMii NAND backup (nand.bin + optional keys.bin) to populate it.
     Most Wii games do not require a real NAND dump.
+  bt_passthrough_note: >
+    Bluetooth passthrough allows connecting real Wiimotes via USB Bluetooth adapters.
+    Realtek chipsets (very common) require firmware files in Load/Firmware/rtl_bt/.
+    Dolphin can auto-download these from kernel-firmware/linux-firmware on GitLab.
+    15 device families supported (8723A/B/D, 8761A/BU, 8821A/C, 8822B/CU, 8851BU,
+    8852AU/BU/CU/BTU, 8922AU). Each needs _fw.bin (required) + _config.bin (optional).
+    ref: RealtekFirmwareLoader.cpp:75-179 (device IDs), 382-420 (firmware names)