Update configuration files for model providers and Docker setup

[AnkushMalaker]

• Changed LLM, embedding, and STT providers in config.yml to OpenAI and Deepgram.
• Removed read-only flag from config.yml in Docker Compose files to allow UI configuration saving.
• Updated memory configuration endpoint to accept plain text for YAML input.

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✨ Finishing touches

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• Commit unit tests in branch fix/cleanup-model-2

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[github-actions]

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