Add complete Gitea package publishing support

✨ Features:
- GiteaPackageRegistry client for PyPI-compatible uploads
- Enhanced release.py with upload/registry commands
- New Makefile targets for Gitea publishing workflow
- Comprehensive documentation with examples

📦 New Commands:
- `release.py registry` - Show registry info & authentication
- `release.py upload` - Upload packages to Gitea
- `release.py publish --to-gitea` - Complete release + upload
- `make release-publish-gitea VERSION=x.y.z` - One-command release

🔧 Infrastructure:
- Automatic package detection (wheel + sdist)
- Dry-run support for safe testing
- Error handling and detailed feedback
- Authentication validation

📚 Documentation:
- PACKAGE_PUBLISHING.md with complete setup guide
- Usage examples and troubleshooting

🚀 Generated with [Claude Code](https://claude.ai/code)

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

Makefile

@@ -41,6 +41,9 @@ help:
 	@echo "  release-build        - Build release packages (version auto-detected)"
 	@echo "  release-tag VERSION=x.y.z - Create release git tag"
 	@echo "  release-publish VERSION=x.y.z - Complete release workflow (tag + build)"
+	@echo "  release-publish-gitea VERSION=x.y.z - Release + upload to Gitea registry"
+	@echo "  release-upload-gitea - Upload existing packages to Gitea registry"
+	@echo "  release-registry     - Show Gitea package registry information"
 	@echo "  release-dry-run VERSION=x.y.z - Test release workflow"
 	@echo ""
 	@echo "Chaos Engineering:"
@@ -522,6 +525,23 @@ release-dry-run:
 	fi
 	$(VENV_PYTHON) release.py publish --version $(VERSION) --dry-run
 
+release-publish-gitea:
+	@echo "🚀 Publishing complete release with Gitea upload..."
+	@if [ -z "$(VERSION)" ]; then \
+		echo "❌ Usage: make release-publish-gitea VERSION=1.0.0"; \
+		echo "ℹ️  This creates git tag + builds packages + uploads to Gitea"; \
+		exit 1; \
+	fi
+	$(VENV_PYTHON) release.py publish --version $(VERSION) --to-gitea
+
+release-upload-gitea:
+	@echo "📡 Uploading packages to Gitea registry..."
+	$(VENV_PYTHON) release.py upload
+
+release-registry:
+	@echo "📦 Gitea package registry information..."
+	$(VENV_PYTHON) release.py registry
+
 # Chaos Engineering targets
 chaos-validate:
 	@echo "🔥 Running architectural independence validation..."