test: integration test for Asahi firstboot LVM setup

VM-based end-to-end test using Fedora cloud image with two disks:
root (20GB) + data (200GB). Verifies the firstboot script creates
labvg with correct LV sizes, mounts volumes, migrates /home content,
sets hostname, creates admin user, and handles reprovision.

Fixes to firstboot script:
- Detect whole disks (not just partitions) for LVM PV
- Handle btrfs subvolume paths in root device detection
- Copy /home content before mounting LV (preserves SSH keys)
- Don't restart sshd (config takes effect on reboot)
- Make swapon and mount operations resilient to failures

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

bastion/package.json

@@ -22,7 +22,9 @@
     "test:integration:iso": "vitest run -c tests/integration/vitest.config.ts -t 'ISO boot'",
     "test:integration:iso:host": "sudo -E $(which npx) vitest run -c tests/integration/vitest.config.ts -t 'ISO boot'",
     "test:integration:arm-iso": "vitest run -c tests/integration/vitest.config.ts -t 'ARM ISO'",
-    "test:integration:arm-iso:host": "sudo -E $(which npx) vitest run -c tests/integration/vitest.config.ts -t 'ARM ISO'"
+    "test:integration:arm-iso:host": "sudo -E $(which npx) vitest run -c tests/integration/vitest.config.ts -t 'ARM ISO'",
+    "test:integration:asahi": "vitest run -c tests/integration/vitest.config.ts -t 'asahi firstboot'",
+    "test:integration:asahi:host": "sudo -E $(which npx) vitest run -c tests/integration/vitest.config.ts -t 'asahi firstboot'"
   },
   "engines": {
     "node": ">=20.0.0",