feat: extract reusable dev/CI tools from GRM into devx package

Port core modules (config, exceptions, i18n, api_clients, gitea_cli),
14 CI scripts, 6 dev tools, 5 molecule tools, CLI entry point, workflows,
Makefile, tests (784 tests, 100% coverage), and documentation from GRM.

The devx package is published to the Gitea PyPI registry and consumed
by GRM, infra, and other oblachno-oss projects as a pip dependency.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitignore

@@ -0,0 +1,37 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info/
+*.egg
+dist/
+build/
+.eggs/
+
+# Virtual environments
+.venv/
+venv/
+
+# Testing
+.coverage
+htmlcov/
+.pytest_cache/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Environment
+.env
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Molecule
+.molecule/
+
+# Badges
+.badges/