feat: platform-core registry for exact pack generation

resolve_platform_cores() links platforms to their cores via
three strategies: all_libretro, explicit list, system ID
fallback. Pack generation always includes core requirements
beyond platform baseline. Case-insensitive dedup prevents
conflicts on Windows/macOS. Data dir strip_components fixes
doubled paths for Dolphin and PPSSPP caches.

platforms/recalbox.yml

@@ -5,6 +5,199 @@ source: "https://gitlab.com/recalbox/recalbox/-/raw/master/board/recalbox/fsover
 base_destination: bios
 hash_type: md5
 verification_mode: md5
+cores:
+  - "2048"
+  - 81
+  - a5200
+  - advancemame
+  - amiberry
+  - applewin
+  - arduous
+  - atari800
+  - b2
+  - beebem
+  - bk
+  - bluemsx
+  - boom3
+  - bsnes
+  - bsneshd
+  - cannonball
+  - cap32
+  - cdi2015
+  - corsixth
+  - craft
+  - crocods
+  - daphne
+  - desmume
+  - dice
+  - dinothawr
+  - dirksimple
+  - dolphin
+  - dolphin-gui
+  - dosbox
+  - dosbox_pure
+  - duckstation
+  - easyrpg
+  - ecwolf
+  - emuscv
+  - fake08
+  - fba2x
+  - fbneo
+  - fceumm
+  - flycast
+  - flycast-next
+  - fmsx
+  - freechaf
+  - freeintv
+  - frotz
+  - fuse
+  - gambatte
+  - gearcoleco
+  - geargrafx
+  - gearsystem
+  - genesisplusgx
+  - genesisplusgx_ex
+  - genesisplusgxwide
+  - geolith
+  - glide64mk2
+  - gliden64
+  - gliden64_20
+  - gong
+  - gpsp
+  - gsplus
+  - gw
+  - handy
+  - hatari
+  - hatarib
+  - holani
+  - imageviewer
+  - julius
+  - kronos
+  - lowresnx
+  - lutro
+  - mame0258
+  - mame0278
+  - mame2000
+  - mame2003
+  - mame2003_plus
+  - mame2010
+  - mame2015
+  - mame2016
+  - mednafen_lynx
+  - mednafen_ngp
+  - mednafen_pce_fast
+  - mednafen_pcfx
+  - mednafen_psx
+  - mednafen_psx_hw
+  - mednafen_saturn
+  - mednafen_supafaust
+  - mednafen_supergrafx
+  - mednafen_vb
+  - mednafen_wswan
+  - melonds
+  - mesen
+  - mesen_s
+  - meteor
+  - mgba
+  - minivmac
+  - mojozork
+  - moonlight
+  - mrboom
+  - mu
+  - mupen64plus
+  - mupen64plus_next
+  - n64_gles2
+  - neocd
+  - nestopia
+  - np2kai
+  - nxengine
+  - o2em
+  - openbor
+  - openlara
+  - opera
+  - oricutron
+  - parallel_n64
+  - pcsx2
+  - pcsx_rearmed
+  - pico8
+  - picodrive
+  - pisnes
+  - pokemini
+  - potator
+  - ppsspp
+  - prboom
+  - prosystem
+  - ps2
+  - puae
+  - px68k
+  - quasi88
+  - quicknes
+  - race
+  - rb5000
+  - reicast
+  - reminiscence
+  - retro8
+  - retrodream
+  - rice
+  - rice_gles2
+  - sameboy
+  - same_cdi
+  - sameduck
+  - scummvm
+  - sdlpop
+  - simcoupe
+  - snes9x
+  - snes9x2002
+  - snes9x2005
+  - snes9x2010
+  - solarus
+  - stella
+  - stella2014
+  - stonesoup
+  - supermodel
+  - swanstation
+  - tamalibretro
+  - tgbdual
+  - theodore
+  - thepowdertoy
+  - ti99sim
+  - tic80
+  - tyrquake
+  - uae4all
+  - uae4arm
+  - uzem
+  - vecx
+  - vice_x128
+  - vice_x64
+  - vice_x64sc
+  - vice_xcbm2
+  - vice_xcbm5x0
+  - vice_xpet
+  - vice_xplus4
+  - vice_xscpu64
+  - vice_xvic
+  - virtualjaguar
+  - vitaquake2
+  - vitaquake3
+  - vitavoyager
+  - vpinball
+  - vvvvvv
+  - wasm4
+  - x1
+  - x128
+  - x64
+  - x64sx
+  - xcbm2
+  - xcbm5x0
+  - xemu
+  - xpet
+  - xplus4
+  - xrick
+  - xroar
+  - xscpu64
+  - xvic
+  - yabasanshiro
+  - yabause
 systems:
   commodore-amiga:
     files: