Add Authentication local LLM

[Pushkinmazila2]

Description

This PR adds support for API Token authentication (Bearer Token) for the LM Studio provider.

Previously, if LM Studio had "Require Authentication" enabled, the tool would fail with a 401 Unauthorized error because there was no way to provide or pass an API key in the headers.

Changes:

• Updated the setup wizard to prompt for an API Key when LM Studio is selected.
• Added lmstudio_api_key to the configuration schema and config.toml.
• Modified the Embedder and indexer logic to include the Authorization: Bearer <token> header in requests to the LM Studio API.
• Updated the CLI search and index commands to correctly pass the token to the backend.

Motivation and Context

Fixes an issue where users couldn't use the tool with secured LM Studio instances.
Error addressed: httpx.HTTPStatusError: Client error '401 Unauthorized' for url 'http://localhost:1234/v1/embeddings'

How Has This Been Tested?

1. Enabled "Require Authentication" in LM Studio (Developers Page).
2. Ran obsidian-notes-rag setup and provided the API Key.
3. Successfully performed indexing using obsidian-notes-rag index.
4. Verified that semantic search works via obsidian-notes-rag search "query".

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