Add .npmrc for bun usage and update dependencies

- Created a new .npmrc file to enforce bun usage.
- Bumped version numbers for multiple packages to 0.1.9 in bun.lock.
- Added react-sound-visualizer dependency to enhance audio visualization features.
- Introduced convert:assets script in package.json for asset optimization.
- Updated CONTRIBUTING.md with instructions for converting assets to web formats.
- Added documentation files for API endpoints and developer guidelines in the docs directory.

docs/api/recordings.mdx

@@ -0,0 +1,95 @@
+---
+title: "Recordings API"
+description: "Record and transcribe audio"
+---
+
+## Start Recording
+
+```http
+POST /recordings/start
+```
+
+**Request:**
+```json
+{
+  "source": "microphone"
+}
+```
+
+**Response:**
+```json
+{
+  "recording_id": "rec123",
+  "status": "recording"
+}
+```
+
+## Stop Recording
+
+```http
+POST /recordings/stop
+```
+
+**Request:**
+```json
+{
+  "recording_id": "rec123"
+}
+```
+
+**Response:**
+```json
+{
+  "recording_id": "rec123",
+  "audio_url": "/audio/rec123.wav",
+  "duration": 15.5
+}
+```
+
+## Transcribe Audio
+
+```http
+POST /transcribe
+```
+
+**Request:** (multipart/form-data)
+```
+audio: <file>
+language: "en" (optional)
+```
+
+**Response:**
+```json
+{
+  "text": "Transcribed speech text here",
+  "language": "en",
+  "duration": 15.5,
+  "confidence": 0.95
+}
+```
+
+## TypeScript Example
+
+```typescript
+import { VoiceboxClient } from '@/lib/api'
+
+const client = new VoiceboxClient({
+  baseUrl: 'http://localhost:17493'
+})
+
+// Start recording
+const recording = await client.startRecording({
+  source: 'microphone'
+})
+
+// ... record audio ...
+
+// Stop recording
+const result = await client.stopRecording(recording.id)
+
+// Transcribe
+const transcription = await client.transcribe(audioFile, 'en')
+console.log(transcription.text)
+```
+
+For full API documentation, visit `http://localhost:17493/docs` when the server is running.