Add backend test suite, CI health checks, and gated Render deploy

[ganeshkarthik016]

What this does

• Adds a Node built-in test-runner suite (backend/tests/) covering auth-gating
  and basic route behavior for blogs, comments, follows, likes, notes,
  notifications, playlists, playlist-shares, and users.
• Adds check (cross-platform syntax check) and test scripts to
  backend/package.json.
• Adds a health-check wait step to CI before running tests, so the test job
  doesn't race against the backend container still starting up.
• Adds a deploy job that only runs on pushes to main (not PRs), gated on
  both frontend and backend jobs passing, which triggers Render's deploy
  hook.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
book-hub	Ready	Preview	Aug 30, 2026 4:46pm