fix(scan): restore immediate quick scoring

[AsperforMias]

Summary

• replace the user-facing durable scan path with one synchronous bounded quick scan that immediately materializes the existing v9 deterministic score and enables the roast flow
• remove the deployed worker, Cron/status endpoints, polling UI, worker script, and related operational documentation; no web request can enqueue or wait on a global scan job
• keep v5/v5/v3 as the only read-only emergency fallback, used only when the quick collector fails
• bind default-model roast generation to the exact server quick snapshot that backs the current v9 score

Verification

• pnpm test (65 files, 495 tests)
• pnpm typecheck
• pnpm lint
• pnpm versions:check (v9/v9/v4, canonical)
• pnpm build
• manually checked the home flow in light, dark, auto, and mobile layouts

Operational effect

No worker deployment or Vercel Cron configuration is required after merge. Historical queue rows stay stored but have no runtime entrypoint.

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