Kann ich Portfolio Coach vibecoden?

Build me a local-first UK family portfolio tracker like Portfolio Coach. Requirements:

- Next.js 16 App Router + TypeScript, Tailwind, better-sqlite3, and Recharts;
  run locally with `npm run dev` and bind to localhost only.
- Model household members, accounts, and UK wrappers: ISA, SIPP, GIA, pension,
  cash, bonds, and property with mortgages.
- Holdings need ticker, units, cost basis, currency, manual price, and optional
  market price. Always show the quote source and last-updated time.
- Add a CSV importer with saved column mappings and dedupe on a stable row hash.
  Include a mapping for a documented Vanguard transaction CSV example.
- Dashboard: household net worth, value by person, allocation, wrapper split,
  concentration warnings, gain/loss, and stale-price warnings.
- Add editable monthly contributions and a projection chart with retirement age,
  growth, inflation, withdrawals, and planned gifts as explicit assumptions.
- Add a UK planning page for ISA/SIPP/GIA balances and an indicative inheritance-
  tax snapshot. Keep thresholds in one dated config file and label this as
  informational, not financial or tax advice.
- Add an AI review that sends only the calculated portfolio summary to an
  OpenAI-compatible API. Put secrets in `.env.local`; work without AI too.
- Store everything in one local SQLite file and add an encrypted JSON export plus
  a dated backup command. Include a realistic seeded demo household.
- No accounts, telemetry, broker logins, automatic bank sync, or cloud sharing.
  Out of scope: regulated advice and production-grade real-time fund pricing.
- README with setup, CSV format, backup/restore, data limitations, and the exact
  assumptions used by projections and tax estimates.

Antworte mir auf Deutsch. Oberfläche, Kommentare und README auf Deutsch, alle Bezeichner wie Tabellen, Spalten, Variablen, Routen und Dateinamen bleiben Englisch.