Introduce NT SILK-based voice (PTT) upload pipeline and native FFmpeg addon wrapper.
- Add ffmpeg-addon wrapper (packages/core/src/bridge/highway/ffmpeg-addon.ts) to load platform/arch .node binaries, detect SILK files, and convert inputs to NT SILK via the native addon. Provides encodeSilk, isSilkFile and default temp dir helpers.
- Implement ptt-upload pipeline (packages/core/src/bridge/highway/ptt-upload.ts) to: resolve/fetch audio bytes, convert to NT SILK if needed, send OIDB upload request, perform highway HTTP upload when required, and produce Encodable MsgInfo bytes for commonElem.
- Wire record element support into element-builder: uploadPttMsgInfo is used to build a commonElem for 'record' sends; when SendContext is absent, record sends are skipped with a warning (graceful no-bridge path).
- Update message parsing to accept record segments from data.file, data.url or data.path and drop empty sources.
- Enable canSendRecord in OneBot instance context.
- Add tests covering record parsing and the graceful send path (packages/core/tests/message-parser.test.ts).
- Include prebuilt native ffmpeg addon binaries under packages/runtime/native/ffmpeg and update vite config to validate & copy the ffmpeg addon into the dist layout.
These changes enable sending voice messages by converting/encoding sources to the expected NT SILK format and uploading them through the existing highway/NTV2 flows.
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