Add version tracking via pyproject.toml

- Add pyproject.toml with project metadata and version 1.0.0
- Update config.py to load version from pyproject.toml
- Update Dockerfile to include pyproject.toml in build
- Add CHANGELOG.md documenting initial release
- Update build workflow registry to internal domain

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -0,0 +1,10 @@
+[project]
+name = "core-api"
+version = "1.0.0"
+description = "Core Code API - Infrastructure management and tools API"
+readme = "README.md"
+requires-python = ">=3.12"
+license = {text = "MIT"}
+
+[tool.setuptools]
+packages = ["src"]