Show deployment progress on GitHub PRs like Vercel — environment name,
status indicator, and deployment link.

- Add `github_deployment_id` column to deployments table
- Add `CreateDeployment` and `CreateDeploymentStatus` to GitHubClient
- Create `deploymentStatusReporter` interface with noop pattern
- Wire status reporting into deploy workflow lifecycle
- Add `pkg/httpclient` generic HTTP helper to clean up GitHub API calls
- Refactor existing GitHub client to use httpclient (removes boilerplate)

Status updates at each phase: pending → in_progress (build/deploy/network) → success/failure
All GitHub calls are fire-and-forget — GitHub outages never block deploys.

…t status

- Add dashboard_url toml config (defaults to https://app.unkey.com)
- Add logURL param to CreateDeploymentStatus for GitHub "View logs" link
- Set dashboard_url to http://localhost:3000 in local dev
- Add debug logging when repo connection is not found

Split monolithic github_status.go into:
- status_reporter.go: interface + factory (createStatusReporter)
- status_reporter_noop.go: no-op implementation
- status_reporter_github.go: GitHub Deployments API implementation

Use config struct instead of 10 positional params, extract
formatEnvironmentLabel and formatDomainPrefix helpers, make interface
file minimal with just the interface definition.

- Regenerate BUILD.bazel for split status reporter files
- Add ghDeploymentID to exhaustruct init
- Add DashboardURL to harness config