• Replace lambda with proper async function
• Capture config values at creation time
• Avoid closure variable reference issues
• Add factory function for embeddings
• Remove test file for closure bug
Fixes#2023. Resolves an issue where the embedding function would incorrectly fall back to the OpenAI provider if the server's configuration arguments were mutated after initialization. This was caused by a lambda function capturing a reference to the mutable 'args' object instead of capturing the configuration values at creation time.
