Feature Request: Azure DevOps (Azure Repos + Azure Pipelines) support

## Feature Request

**Is your feature request related to a problem?**
Git-Ape currently only supports GitHub repositories (GitHub Actions, GitHub OIDC, GitHub Environments/Secrets). Users with repositories hosted on Azure DevOps cannot use Git-Ape for IaC deployments.

**Describe the solution you'd like**
Support for Azure DevOps as a git host, including:
- **Azure Pipelines** as the CI/CD engine (equivalent to GitHub Actions workflows)
- **Azure DevOps Service Connections** for Azure authentication (equivalent to GitHub OIDC federated credentials)
- **Azure Pipelines Environments** and **Variable Groups/Secrets** (equivalent to GitHub Environments and Secrets)
- Onboarding skill support for Azure DevOps repos via `az devops` CLI

**Describe alternatives you've considered**
- Mirroring Azure DevOps repos to GitHub — adds operational overhead
- Manually replicating Git-Ape patterns in Azure Pipelines — loses the guided workflow

**Additional context**
Many enterprise teams use Azure DevOps as their primary git host. Supporting Azure DevOps (and potentially other git hosts like GitLab) would significantly expand Git-Ape's reach.