ci: run deploy + smoke jobs on the self-hosted peptide-vps runner (#21)

Shared pipeline deploy-staging + deploy-production (deploy-app.yml) and the Playwright staging smoke (smoke.yml) now run on the org self-hosted runner [self-hosted, peptide-vps] from the VPS stable IP, fixing the Hostinger rotating-runner-IP throttle. CI/validate stay GitHub-hosted. v1.7.1.

QA: APPROVE-WITH-P2-NOTES (2026-06-17-e6f6b67); P2 = pre-existing stale peptiderepo/ owner refs (work via redirect, ref-cleanup batch).

Agent-Session: deploy-self-hosted-20260617

.github/workflows/deploy-app.yml

@@ -35,7 +35,7 @@ permissions:
 jobs:
   deploy-staging:
     name: Deploy to Staging
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, peptide-vps]
     environment: staging
     steps:
       - uses: actions/checkout@v4
@@ -83,7 +83,7 @@ jobs:
     # skipped smoke (run_smoke: false) still allows prod via the if-condition.
     needs: [deploy-staging, smoke]
     if: ${{ !cancelled() && needs.deploy-staging.result == 'success' && needs.smoke.result != 'failure' }}
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, peptide-vps]
     environment: production
     steps:
       - uses: actions/checkout@v4