feat: no-root deploy, remove CI deploy stage, deploy alerts

- deploy.sh installs sops/age to ./bin/ (no root/sudo needed)
- Remove CI deploy stage — supervisor auto-pulls and deploys
  (zero CI secrets: no SSH keys, no deploy credentials)
- Supervisor sends alert on deploy success/failure via webhook

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -55,6 +55,6 @@ dist/
 build/
 *.egg-info/
 
-# Tailwind CSS
-bin/tailwindcss
+# Local binaries (tailwindcss, sops, age)
+bin/
 web/src/padelnomics/static/css/output.css