[Bug] LM Studio - Bearer token

Title: No API key field when connecting to LM Studio — bearer token cannot be configured

Describe the bug When adding a custom LM Studio backend, the connection form only exposes a URL field. There is no dedicated field to enter the bearer token / API key required by LM Studio's server when authentication is enabled.

To Reproduce

1. Enable LM Studio local server with a bearer token set
2. In Accomplish AI, go to Settings > Add LM Studio connection
3. Observe that only a URL field is available
4. There is no way to provide the Authorization header / API key

Expected behavior A dedicated "API Key" or "Bearer Token" field should be available alongside the URL field, so the token can be sent as an Authorization: Bearer <token> header on each request.

Workaround None currently, unless the user sets up a local reverse proxy to inject the header manually.

Environment

• LM Studio version: [0.4.12]
• Accomplish AI version: [0.5.17]
• OS: [Windows / Linux]