JSON-authored quests were serveable via MSG_SYS_GET_FILE but invisible
on the event quest board because loadQuestFile only read .bin files.
CompileQuestJSON already produces the uncompressed binary layout that
the event-board parser expects, so no decompression step is needed.
Also update rengoku priority tests to match the .bin-first convention
fixed in the previous commit.
Operators can now define Hunting Road configuration in a plain JSON file
(rengoku_data.json) instead of maintaining an opaque pre-encrypted binary.
The JSON is parsed, validated, assembled into the binary layout, and
ECD-encrypted at startup; rengoku_data.bin is still used as a fallback.
JSON schema covers both road modes (multi/solo) with typed floor and
spawn-table entries — floor number, spawn-table index, point multipliers,
and per-slot monster ID/variant/weighting fields. Out-of-range references
are caught at load time before any bytes are written.
