models: correct audio pricing rows; add tinfoil/voxtral-small-24b

- whisper-large-v3-turbo: $0.01 per request (flat, zero per-token) — the old
  $0.05/1M-input row was stale (co-op/support#48)
- voxtral-tts: $0.002 per request (was 'listed $0 (verify on invoice)')
- new: tinfoil/voxtral-small-24b, Tinfoil's token-priced STT model
  ($0.20/1M in + $0.60/1M out), with the chunk-equivalent note for the
  transcription route and a chat-with-input_audio example
- note why dashboard audio rows read '$0.01 · 0 tokens' (Tinfoil returns no
  token usage for audio)

models.md

@@ -117,13 +117,27 @@ model picker to avoid confusion.
 
 | Model | Provider | Use | Pricing |
 |---|---|---|---|
-| `🔒 tinfoil/whisper-large-v3-turbo` | Tinfoil | Speech-to-text | $0.05 / 1M input tokens |
+| `🔒 tinfoil/whisper-large-v3-turbo` | Tinfoil | Speech-to-text | $0.01 per request (flat; zero per-token) |
-| `🔒 tinfoil/voxtral-tts` | Tinfoil | Text-to-speech | listed $0 (verify on invoice) |
+| `🔒 tinfoil/voxtral-small-24b` | Tinfoil | Speech-to-text (token-priced) | $0.20 / 1M input + $0.60 / 1M output tokens |
+| `🔒 tinfoil/voxtral-tts` | Tinfoil | Text-to-speech | $0.002 per request (zero per-token) |
 
-Both run inside Tinfoil's enclaves, so voice data gets the same architectural
+All three run inside Tinfoil's enclaves, so voice data gets the same
-privacy as the private chat models. TTS voices available: `neutral_female`,
+architectural privacy as the private chat models. TTS voices available:
-`neutral_male`, `casual_female/male`, `cheerful_female`, plus French, German,
+`neutral_female`, `neutral_male`, `casual_female/male`, `cheerful_female`,
-Spanish, Italian, Portuguese, Dutch, and Hindi variants.
+plus French, German, Spanish, Italian, Portuguese, Dutch, and Hindi variants.
+
+Tinfoil bills these at cost, but its audio API returns **no token usage** to
+the gateway — so dashboard rows for these models read `$0.01 · 0 tokens`: the
+charge is real, the token columns stay empty.
+
+`whisper-large-v3-turbo` and `voxtral-tts` charge **flat per request**.
+`voxtral-small-24b` is token-priced and the better pick for small requests:
+sent through the chat API with `input_audio` it meters exactly per token, and
+on `/v1/audio/transcriptions` (the route dictation uses) the gateway bills
+Tinfoil's measured chunk-equivalent — their audio encoder tokenizes in ~30 s
+chunks, so a short request costs ≈**$0.0001**, about 1/125th of the whisper
+floor. For audio longer than ~30 s, prefer the chat route, which meters
+exactly.
 
 ```bash
 # Speech-to-text
@@ -132,6 +146,15 @@ curl https://gateway.inference.coop/v1/audio/transcriptions \
   -F file=@your-audio.mp3 \
   -F model=tinfoil/whisper-large-v3-turbo
 
+# Speech-to-text (token-priced model, chat route — meters exactly per token)
+curl https://gateway.inference.coop/v1/chat/completions \
+  -H "Authorization: Bearer ***" \
+  -H "Content-Type: application/json" \
+  -d '{"model": "tinfoil/voxtral-small-24b", "messages": [{"role": "user", "content": [
+        {"type": "text", "text": "Transcribe this audio."},
+        {"type": "input_audio", "input_audio": {"data": "<base64 audio>", "format": "wav"}}
+      ]}]}'
+
 # Text-to-speech (returns WAV audio)
 curl https://gateway.inference.coop/v1/audio/speech \
   -H "Authorization: Bearer ***" \