feat: prioritize clouds with CLI installed + hcloud CLI integration (#1375)

* fix: auto-run gcloud auth login on expired GCP tokens

Instead of telling users to run `gcloud auth login` manually, just
run it automatically when auth check fails or instance creation hits
a reauthentication error, then retry.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: prioritize clouds with CLI installed + hcloud CLI integration

When selecting a cloud provider, clouds are now sorted in 3 tiers:
1. Credentials detected (env vars set) — top priority
2. CLI installed (e.g., gcloud, hcloud, aws) — middle priority
3. Neither — default order

Also adds hcloud CLI-first support for Hetzner operations (server
create/delete/list, SSH key management, auth) with automatic fallback
to the existing REST API when hcloud is not available.

Closes #1370

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* refactor: rename aws-lightsail to aws across the project

Simplifies the cloud key from "aws-lightsail" to "aws" — AWS should
have a single entry regardless of the underlying service used.

Renames the directory, updates manifest.json matrix keys, CLI map,
test fixtures, README, and all agent scripts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: lab <6723574+louisgv@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "type": "module",
   "bin": {
     "spawn": "cli.js"