feat: replace Whisper with Deepgram ASR + speaker diarization

frontend/app.js

@@ -0,0 +1,10 @@
+const API_BASE = '/api/v1';
+async function upload(file) {
+    const formData = new FormData();
+    formData.append('file', file);
+    const res = await fetch(API_BASE + '/upload', {
+        method: 'POST',
+        body: formData
+    });
+    return await res.json();
+}