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/authentication.mdx

@@ -0,0 +1,55 @@
+---
+title: "Authentication"
+description: "API authentication and security"
+---
+
+## Current Status
+
+<Warning>
+  Authentication is not currently implemented in Voicebox. The API is intended for local use only.
+</Warning>
+
+## Local Usage
+
+For local development and usage:
+- API runs on `localhost:17493`
+- No authentication required
+- Access restricted to local machine
+
+## Future Implementation
+
+Authentication will be added in a future release for:
+- Remote deployments
+- Multi-user access
+- Production environments
+
+Planned authentication methods:
+- API keys
+- OAuth 2.0
+- JWT tokens
+
+## Security Best Practices
+
+Until authentication is implemented:
+
+<CardGroup cols={2}>
+  <Card title="Use VPN" icon="shield">
+    Use WireGuard or Tailscale for remote access
+  </Card>
+  <Card title="Reverse Proxy" icon="server">
+    Run behind nginx with basic auth
+  </Card>
+  <Card title="Firewall" icon="fire">
+    Restrict access to trusted IPs only
+  </Card>
+  <Card title="Local Only" icon="laptop">
+    Don't expose to public internet
+  </Card>
+</CardGroup>
+
+## Coming Soon
+
+- API key management
+- User accounts
+- Rate limiting
+- Access control