Use UV for dependency management

[tudoramariei]

• update dockerfiles, makefiles, pyproject
• remove requirements files in favour of uv.lock & pyproject

[Copilot]

Pull Request Overview

Migrate dependency management from pip-compiled requirements to Astral UV by updating Dockerfiles, Makefile, and pyproject.toml and removing old requirements files.

• Added UV installer and replaced virtualenv creation and pip installs with uv venv and uv sync
• Removed all requirements.txt/.in files, introduced pyproject.toml + uv.lock
• Updated Makefile targets to use uv sync instead of pip-compile

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docker/dockerfiles/Dockerfile.dev	Install UV, swap python3 -m venv + pip installs for uv venv + uv sync
docker/dockerfiles/Dockerfile	Add UV installer, replace pip venv/install with uv venv + uv sync
backend/requirements.txt	Removed obsolete requirements file
backend/requirements.in	Removed obsolete requirements file
backend/requirements-dev.txt	Removed obsolete dev requirements file
backend/requirements-dev.in	Removed obsolete dev requirements file
backend/pyproject.toml	Added project metadata, dependencies, dev groups; removed pip-tools config
Makefile	Changed dependency targets to use uv sync and updated comments accordingly

Comments suppressed due to low confidence (4)

backend/pyproject.toml:2

• Project name is empty; specify a valid package name to ensure correct metadata and distribution.

name = ""

backend/pyproject.toml:120

• Black's target-version is set to py312 but requires-python is >=3.13; update to py313 (or appropriate) for consistency.

target-version = ["py312"]

Makefile:154

• The comment mentions pip compile but the target uses uv sync; update the description to accurately reflect the new command.

requirements-build:               ## run uv pip compile and add requirements from the *.in files

Makefile:160

• Clarify this comment to reflect use of uv sync --active -U instead of pip-compile for updating dependencies and lock file.

requirements-update:              ## run uv pip compile and rebuild the requirements files