Migrate Python dependency management from Poetry to uv

[Copilot]

This change replaces Poetry-based dependency management with uv across local workflows and container builds. The goal is to standardize on uv for dependency resolution, locking, and command execution in this repository.

• Project metadata and dependency model

  • Converted pyproject.toml from Poetry tables to PEP 621 ([project]).
  • Moved dev dependencies to uv-compatible [dependency-groups].
  • Updated build backend from poetry-core to setuptools.build_meta.

• Developer workflows

  • Replaced poetry run ... with uv run ... in Taskfile.yaml for:
    • tests
    • CRD generation
    • datamodel generation

• Container dependency export

  • Updated both Dockerfiles (docker/operator/Dockerfile, docker/jobs/Dockerfile) to:
    • install uv instead of Poetry
    • export requirements via uv export
    • exclude dev deps and local editable project emission (--no-dev --no-emit-project)

• Lockfile migration

  • Removed poetry.lock.
  • Added uv.lock as the new lock source for reproducible dependency resolution.

Example of the command migration pattern:

# Taskfile.yaml
cmds:
  - uv run pytest -v --show-capture=all