feat: Complete FastAPI backend implementation with authentication, OpenAI integration, and PostgreSQL support#80

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copilot/fix-2c7b4dbb-5a82-4739-b25c-ccdd953f5989vidaluca77-cloud/LaVidaLuca-App:copilot/fix-2c7b4dbb-5a82-4739-b25c-ccdd953f5989Copy head branch name to clipboard