Reintroduce wheel building in Dockerfile

[javidahmed64592]

This pull request updates the build and deployment process for the Python Template Server by introducing a multi-stage Docker build and improving dependency management. The changes streamline the image creation, optimize dependency installation, and enhance configuration for direct references.

Docker build and dependency management improvements:

• Added a multi-stage build to the Dockerfile using a builder stage to build the Python wheel with uv, and a runtime stage to install the built wheel, resulting in a more efficient and secure image.
• Replaced installing dependencies from a remote Git repository with installing the locally built wheel in the runtime stage, reducing build-time dependencies and improving reproducibility.

Configuration enhancements:

• Enabled direct references for dependencies in pyproject.toml by adding the [tool.hatch.metadata] allow-direct-references = true section, supporting more flexible dependency management.