Add 49738 build metadata to external JSONs

Register new builds and architecture-specific offsets/IDs for 9.9.31-49738 and 3.2.29-49738. Updated packages/napcat-core/external/appid.json to add appid/qua entries, and napi2native.json and packet.json to add send/recv offsets for x64 (and arm64 where applicable). These additions track the new builds and their native mappings.