Migrate to uv for Python dependency management

[m1rl0k]

Replaces pip with uv for faster and more reliable Python dependency installation across all Dockerfiles, CI workflows, and documentation. Adds pyproject.toml and uv.lock files, updates Makefile with uv targets, and adjusts .gitignore for new virtual environment conventions. Embedding service now uses its own pyproject.toml and lock file. Docker Compose and development docs updated to reflect uv usage.

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🤖 Augment PR Summary

Summary: This PR migrates the repo from pip/requirements-based installs to uv for faster, reproducible Python dependency management across CI, Docker images, and developer workflows.

Changes:

• Updates GitHub Actions CI to install uv, cache uv artifacts, run uv sync --locked, and execute commands via uv run.
• Reworks all Python Dockerfiles to copy pyproject.toml/uv.lock, install deps via uv sync --locked, and run with the project venv on PATH.
• Adds a repo-wide .python-version (3.11) to standardize the interpreter version.
• Introduces uv-sync / uv-run Makefile targets and marks legacy venv targets as such.
• Updates development documentation and CLI docs to recommend uv usage.
• Adds an embedding_service-scoped pyproject.toml + uv.lock for that service’s dependencies.
• Adjusts .gitignore for the new default virtualenv directory (.venv) and generated bridge artifacts.

Technical Notes: Docker builds use BuildKit cache mounts for uv’s cache, and runtime commands rely on the per-image /app/.venv environment.

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