Add poetry for api

[DaniilSmirnov]

Hi! I add poetry instead of plain requirements.txt to enhance developer experience

[gemini-code-assist]

Summary of Changes

Hello @DaniilSmirnov, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant change to how Python dependencies are managed for the API, transitioning from the traditional pip and requirements.txt setup to using Poetry. This migration aims to streamline the development workflow, improve dependency resolution, and ensure more consistent environments across development and deployment. The changes encompass updates to Docker build processes, modifications to all installation documentation, and a restructuring of dependency definition files.

Highlights

• Dependency Management Migration: The API's Python dependency management has been migrated from pip and requirements.txt to Poetry, enhancing developer experience and project reproducibility.
• Dockerfile Updates: Both Dockerfile and Dockerfile-ollama-local have been updated to install Python dependencies using Poetry, including copying pyproject.toml and poetry.lock and running poetry install.
• Documentation Updates: All relevant README.md files (including localized versions and api/README.md) have been updated to reflect the new Poetry-based installation instructions for Python dependencies.
• File Restructuring: The api/requirements.txt file and the root pyproject.toml have been removed, replaced by a new api/pyproject.toml to centralize API dependency definitions with Poetry.

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[gemini-code-assist]

Code Review

This pull request successfully migrates the API's dependency management from requirements.txt to Poetry, which is a great improvement for developer experience and build reproducibility. However, there are a few critical issues with incorrect version specifications for poetry and poetry-core that will cause build and installation failures. I've provided suggestions to fix these. Additionally, the installation instructions in the documentation files need to be corrected to ensure they work as intended. I've also included some recommendations to further enhance the pyproject.toml configuration.

[sng-asyncfunc]

If we can get a few more thumbs up on this changes i will merge it in