feat: add 10 emulator profiles (batch 4)

blastem (MD, no BIOS needed), dosbox_pure (14 MT-32 ROMs + SF2),
desmume (NDS, 3 files all HLE), cap32 (CPC, all embedded),
mu (Palm OS, 5 ROMs), bk (Elektronika BK, 9 Soviet ROMs),
gearsystem (SMS/GG, 2 optional boot ROMs),
beetle_ngp (Neo Geo Pocket, pure HLE), beetle_wswan (WonderSwan, pure HLE),
galaksija (Yugoslav computer, all embedded)

51 total profiles. Cross-reference: 658 undeclared, 177 in repo.

emulators/beetle_ngp.yml

@@ -0,0 +1,33 @@
+emulator: Beetle NGP (Mednafen Neo Geo Pocket)
+type: libretro
+source: "https://github.com/libretro/beetle-ngp-libretro"
+systems: [snk-ngp, snk-ngpc]
+
+notes: |
+  Beetle NGP is a fork of Mednafen's NeoPop module for Neo Geo Pocket
+  and Neo Geo Pocket Color emulation via libretro.
+
+  No external BIOS or firmware files are required. The core uses a
+  built-in High-Level Emulation (HLE) BIOS that is constructed at
+  runtime by bios_install() in mednafen/ngp/bios.c.
+
+  The HLE BIOS populates a 64KB array (ngpc_bios[0x10000]) with:
+  - A system call vector table at 0xFE00 (27 entries covering
+    clock, RTC, interrupts, font, flash read/write, comms)
+  - Each vector target contains an iBIOSHLE instruction (opcode 0x1F)
+    that traps into biosHLE.c for high-level handling
+  - A built-in system font (2048 bytes at 0x8DCF)
+  - A default interrupt handler (RETI at 0x23DF)
+  - An infinite loop at 0xFFFE as the idle entry point
+
+  The TLCS-900h CPU (main) and Z80 (sound) are both emulated in
+  software. Flash memory for game saves is handled internally via
+  flash.c without needing a separate firmware dump.
+
+  The only core option is ngp_language (english/japanese), which
+  controls the language flag passed to games. It does not affect
+  BIOS loading.
+
+  ROM extensions: .ngp, .ngc, .ngpc, .npc
+
+files: []