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>

hooks/pre-commit

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# pre-commit hook: fail if unit tests take longer than 10 seconds.
+# Aligned with CI timeout (ci.yml uses --max-seconds 10).
+set -e
+export PYTHONPATH=src
+python -m devx.tools.check_test_speed --max-seconds 10

hooks/pre-push

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+# pre-push hook: run full test suite with 100% coverage enforcement.
+set -e
+export PYTHONPATH=src
+.venv/bin/pytest tests/ -v --cov=src/devx --cov-report=term-missing --cov-fail-under=100