Kann ich Surfer SEO vibecoden?

Build me a content-brief and draft-scoring tool to replace Surfer SEO, personal scale. Requirements:

- A Node CLI with two commands: brief "<keyword>" and score <draft.md> "<keyword>".
- brief: fetch the top 10 results from Serper.dev (key in .env), download each page,
  extract title, headings, and body text with cheerio + @mozilla/readability.
- Compute across the winners: median word count, recurring H2/H3 topics, and the 30
  most frequent meaningful terms via simple tf-idf. No NLP service.
- Send that to an LLM (key in .env) to write briefs/<keyword>-YYYY-MM-DD.md: suggested
  outline, target word count, terms to cover, questions to answer.
- score: compare my draft against the brief's term list and outline, print a coverage
  percentage and a table of missing terms in the terminal.
- Cache every SERP response and fetched page in SQLite (better-sqlite3) so re-runs
  cost zero API credits.
- No accounts, no telemetry, everything local except the Serper and LLM calls.
- Out of scope: a writing editor with live scoring, site audits, and rank tracking.
  This outputs Markdown briefs, and page scraping will break on some sites · Serper
  is the one paid dependency, say both in the README.
- README: where to get the Serper key and the rough API cost per brief.

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