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>

.gitea/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Login to Gitea Registry
         uses: docker/login-action@v3
         with:
-          registry: git.schweitz.net
+          registry: git.schweitz.internal
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
@@ -23,5 +23,5 @@ jobs:
           context: .
           push: true
           tags: |
-            git.schweitz.net/jpmschweitzer/core-api:latest
-            git.schweitz.net/jpmschweitzer/core-api:${{ github.ref_name }}
+            git.schweitz.internal/jpmschweitzer/core-api:latest
+            git.schweitz.internal/jpmschweitzer/core-api:${{ github.ref_name }}