feat(LuaGame): migrate solitaire, enable SD external loading
- Enable use_external=true with priority: solitaire, breakout, game, pong, snake, tetris
- Fix is_pico detection to check source content before load (renderer./INPUT.) instead of game.vars heuristic that always true
- Successfully uploaded solitaire.lua (24824 bytes) via /fs/upload?path=/sdcard/lua/solitaire.lua
- Tested solitaire loads: 'loaded external /sdcard/lua/solitaire.lua 24824 bytes, pico=1, FPS 13.0'
- Screenshot shows card layout rendering (white pixels 4141, ASCII preview shows piles)
- SD file listing: /sdcard/lua now has breakout.lua and solitaire.lua
- Ready for further pico games via same upload API
Adolfo
279893eed0