feat: implement dynamic versioning using git tags and hatch-vcs

[aiagate]

Description

This PR transitions the project's versioning from a static string in pyproject.toml to a dynamic system based on Git tags. This enables automatic version calculation during build and automated releases via GitHub Actions.

Key Changes

• Build System: Switched from uv_build to hatchling with hatch-vcs for dynamic versioning.
• pyproject.toml: Removed static version and added dynamic = ["version"].
• GitHub Actions:
  • Updated publish-prod.yml to trigger on v* tag pushes.
  • Added fetch-depth: 0 to checkout steps to ensure all tag history is available for version calculation.
  • Corrected the publishing target name in the workflow output.
• Lockfile: Updated uv.lock to reflect the build system change.

Verification

• Verified that uv build correctly generates a development version string (e.g., 0.1.dev4+gc4d71f436.d20260413) based on the current Git state.
• Verified that uv sync works as expected with the new build backend.

How to Release

1. Tag a commit: git tag v0.1.0
2. Push the tag: git push origin v0.1.0
   The publish-prod workflow will automatically trigger and release to PyPI.