fix(gateway): repair Ogg page CRCs + deliver recordings as MP3

Root cause rekaman gak bisa dibuka: prism-media OggLogicalBitstream
dipanggil dengan crc:false (node-crc dihapus dari dependency tree) —
semua page Ogg punya checksum 0 — player strict (ffmpeg, iOS) tolak
dengan 'CRC mismatch / End of file'. Rekaman 13:11 terbukti CRC-invalid.

Fix:
1. recorder/oggCrc.ts (baru): recompute CRC-32 (RFC3533, poly 0x04c11db7,
   initial 0, MSB-first) tiap page OggS in-place — pure JS tanpa native dep.
2. segmentFinalizer.ts: panggil fixOggCrc sebelum upload/merge.
3. recorder/uploader.ts: transcode segment ke MP3 (libmp3lame 128k 48k
   stereo) sebelum upload tele — universal playback. filename+size DB
   di-update; source OGG tetap untuk transkripsi.
4. muxer.ts + recorder.ts: merged session file juga .mp3.

Verified: ffprobe baca segmen yang tadinya CRC mismatch, MP3 valid.

services/discord-gateway/src/shared/database/voiceRecordingRepo.ts

@@ -81,6 +81,8 @@ export async function updateVoiceRecordingAsUploaded(
   id: string,
   downloadUrl: string,
   uploadedAt: number,
+  filename?: string,
+  sizeBytes?: number,
 ): Promise<void> {
   try {
     await db()
@@ -89,6 +91,8 @@ export async function updateVoiceRecordingAsUploaded(
         download_url: downloadUrl,
         upload_status: "uploaded",
         uploaded_at: uploadedAt,
+        ...(filename !== undefined ? { filename } : {}),
+        ...(sizeBytes !== undefined ? { size_bytes: sizeBytes } : {}),
       })
       .where(eq(voiceRecordingsTable.id, id));
   } catch (error) {