extract shared whisper transcribe helper, use in file-browser and pi stt routes

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/servers/api/pi/rest.ts

@@ -6,6 +6,8 @@ import { readSttConfig } from '../server-settings/stt';
 import { listPiModels } from './list-models';
 import { getHomeDirForRole } from '../../data-path';
 import { logger } from './logger';
+import { transcribeAudio } from '../stt/transcribe';
+import { getUserSettings } from 'officerdb';
 
 export const piRestRouter = createRouter();
 
@@ -72,30 +74,21 @@ piRestRouter.post('/pi/stt', async (ctx: Context) => {
     return ctx.json({ error: 'Whisper not configured — set it up in Settings → Speech to Text' }, 400);
   }
 
+  const user = ctx.get('user');
   const body = await ctx.req.parseBody();
   const file = body['file'];
   if (!file || !(file instanceof File)) {
     return ctx.json({ error: 'file is required' }, 400);
   }
 
-  const formData = new FormData();
-  formData.append('file', file, 'recording.wav');
-  formData.append('temperature', String(body['temperature'] ?? '0.0'));
-  formData.append('temperature_inc', String(body['temperature_inc'] ?? '0.2'));
-  formData.append('response_format', String(body['response_format'] ?? 'json'));
+  const settings = (await getUserSettings(user.id)) as { languages?: { spoken?: string[] } };
+  const spokenLanguages = settings.languages?.spoken ?? [];
 
   try {
-    const res = await fetch(`${sttConfig.url.replace(/\/+$/, '')}/inference`, {
-      method: 'POST',
-      body: formData,
-    });
-    if (!res.ok) {
-      return ctx.json({ error: `Whisper returned ${res.status}` }, 502);
-    }
-    const json = await res.json();
-    return ctx.json(json);
+    const result = await transcribeAudio({ file, whisperUrl: sttConfig.url, spokenLanguages });
+    return ctx.json(result);
   } catch (err) {
     logger.error('STT proxy failed', { error: String(err) });
-    return ctx.json({ error: 'Failed to reach Whisper server' }, 502);
+    return ctx.json({ error: err instanceof Error ? err.message : 'Failed to reach Whisper server' }, 502);
   }
 });