feat(voice): auto-detect speech language for transcription (drop forced 'en')

Whisper previously hardcoded language:en, mis-transcribing id/en-mixed
speech. Omitting 'language' makes Whisper auto-detect. Paired with enabling
AI_VOICE_TRANSCRIPTION_ENABLED (BWS secret gmw_ai_voice_transcription_enabled
= true) so new recordings are transcribed.

Spec: .hermes/plans/2026-08-30_recordings-v2-features-spec.md

.hermes/plans/2026-08-30_recordings-v2-features-spec.md

@@ -0,0 +1,81 @@
+# Spec: Recordings v2 — transcription, search, filters, leaderboard, sessions
+
+## Konteks
+4 fitur lanjutan untuk halaman /recordings (dipilih user):
+1. Tampilkan transkripsi + search by kata kunci
+2. Filter lanjutan: by channel + rentang tanggal
+3. Kelompokkan klip jadi "sesi rapat" + autoplay berurutan + export satu sesi
+4. Leaderboard bicara per user + ringkasan
+
+## Fakta terverifikasi (2026-08-30)
+- `voice_recordings` kolom: id, user_id, username, avatar_url, guild_id,
+  channel_id, channel_name, filename, size_bytes, download_url, upload_status,
+  upload_error, created_at, uploaded_at, **transcription** (schema
+  `shared/database/schema.ts:246`). Index user_id/channel_id/created_at.
+- **Transcription 0/10.640** terisi prod: `AI_VOICE_TRANSCRIPTION_ENABLED`
+  default **false** (config/index.ts:333) & tidak diset di BWS env →
+  `transcribeRecording` (voiceTranscriber.ts) langsung return null.
+  `AI_LLM_BASE_URL` + `AI_LLM_API_KEY` SUDAH dikonfig (Whisper via router GMW).
+- Transcriber hardcode `language: "en"` (voiceTranscriber.ts:34) — salah utk
+  ucapan campur id/en. Utk auto-detect: hapus param `language` (Whisper
+  auto-detect jika tidak diberikan).
+- Backend `RecordingsService.getRecent` (recordings.service.ts) TIDAK select
+  `transcription`; SUDAH dukung filter `channelId`+`userId`+`cursor`; belum
+  dukung date-range & keyword search. `RecordingRow` interface juga tak punya
+  `transcription`.
+- Tidak ada kolom `session_id` / `duration_ms` → sesi grouping = heuristik
+  (channel sama + gap created_at), durasi leaderboard = estimasi dari
+  size_bytes (MP3 128kbps: durasi_s ≈ size_bytes*8/128000).
+
+## Keputusan desain
+1. **Aktifkan transkripsi (fondasi)**: transcriber auto-detect (hapus
+   `language:"en"`), set secret BWS `AI_VOICE_TRANSCRIPTION_ENABLED=true`
+   (dibaca runtime oleh bws-exec saat service start). Rekaman BARU dapat
+   transkripsi. Backfill rekaman lama TIDAK dilakukan (pilih user: fokus baru;
+   file OGG lama kemungkinan besar sudah tidak dipakai).
+2. **Backend** — perluas `getRecent`:
+   - select `transcription` (+ interface RecordingRow + FE type)
+   - filter baru: `q` (ILIKE on transcription + username), `startDate`/`endDate`
+     (created_at range, bigint ms)
+   - endpoint baru `recordings.summary`: agregasi per user → {user_id,
+     username, avatar_url, clips, est_duration_s, words, last_at}. `words`
+     dihitung dari transcription (tokenisasi spasi). Return sorted by clips.
+3. **Frontend**:
+   - Kartu: tampilkan transkripsi (collapse/expand line-clamp) + durasi estimasi.
+   - Toolbar: search box (q), Select channel, date range (start/end), speaker
+     (sudah ada), reset filter.
+   - Tab/segment "Tape Deck" vs "Leaderboard": leaderboard render summary per
+     user + klik → filter deck by user itu.
+   - Sesi grouping (deck view): klip di-group jadi sesi bila channel sama &
+     gap antar klip < SESSION_GAP_MS (default 120s). Header sesi (channel,
+     waktu mulai, jumlah klip, total durasi). Autoplay tombol "Play session" &
+     "Export session WAV" (concat klip sesi via lib/audio/wav.ts yg sudah ada).
+
+## Perubahan file
+
+### Gateway (Tahap 1)
+- `voiceTranscriber.ts`: hapus baris `language: "en"`.
+- (secret) set `AI_VOICE_TRANSCRIPTION_ENABLED=true` via bws.
+
+### Backend (Tahap 2)
+- `recordings.service.ts`: interface + select + getRecent tambah transcription;
+  tambah filter q/startDate/endDate; method getSummary() untuk leaderboard.
+- `orpc/router.ts`: procedur `recordings.list` schema tambah fields; prosedur
+  baru `recordings.summary`.
+
+### Frontend (Tahap 3-5)
+- `lib/types/recording.ts`: tambah transcription, est_duration_s opsional,
+  Summary type.
+- `lib/api/recordings.ts`: list tambah q/startDate/endDate; + summary().
+- `hooks/use-recordings.ts`: propagate filter baru ke key+call; hook
+  useRecordingsSummary.
+- `app/(dashboard)/recordings/view.tsx`: toolbar search+channel+date, kartu
+  transkripsi, tab leaderboard, grouping sesi + autoplay + export sesi.
+
+## Verification
+- tiap tahap: gateway `pnpm build` + `biome check src/`; backend `pnpm build`
+  + `biome check src/ tests/`; FE `pnpm build` + `biome check src/`.
+- CI Build & Deploy hijau tiap tahap; deploy landing dicek via
+  `systemctl show gmw-<svc>.service --property=ActiveEnterTimestamp`.
+- Tahap 1c: setelah deploy + rekaman baru, cek
+  `SELECT COUNT(*) FROM voice_recordings WHERE transcription IS NOT NULL`.

services/discord-gateway/src/modules/voice-recording/voiceTranscriber.ts

@@ -31,7 +31,7 @@ export async function transcribeRecording(
     const response = await openai.audio.transcriptions.create({
       file: createReadStream(oggPath),
       model: "whisper-1",
-      language: "en",
+      // No `language` param → Whisper auto-detects (handles id/en mixed).
       response_format: "text",
     });