feat(runtime): embed platform modules as bytecode
ui.lua and hints.lua are compiled to LUA_32BITS bytecode (matching the firmware's Lua build) and linked into the binary. A new package.searchers entry checks them as the fallback after the SD card, so a local /.lua/lib/ui.lua still shadows the packaged one for debugging. Bytecode is ~40% smaller than source and loads without parsing. A fresh SD card with no make sdcard now has the platform available.
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