Vale construir sua versão de Salesforce?

Build a single-user personal CRM that runs locally. No accounts, no cloud, no telemetry.

Stack, non-negotiable:
- Next.js (App Router) with TypeScript
- SQLite via better-sqlite3, file at ./data/crm.db
- Drizzle ORM for schema and migrations
- Tailwind CSS, no component library
- Runs with `npm run dev` on port 3000 and nothing else needs to be installed

Data model:
- companies: id, name, domain, notes, createdAt
- contacts: id, companyId (nullable), name, email, phone, role, notes, createdAt
- deals: id, title, companyId, contactId (nullable), amountCents, currency (default USD), stage, expectedCloseDate, createdAt, closedAt, outcome (won|lost|null)
- activities: id, kind (call|email|meeting|note), subject, body, occurredAt, contactId, dealId, createdAt
- tasks: id, title, dueDate, done, contactId, dealId
- Stages are a fixed list in code: lead, qualified, proposal, negotiation, closed.

Screens:
1. /pipeline: kanban board, one column per stage, deal cards showing title, company, amount. Drag between columns persists the stage. Column headers show count and summed amount.
2. /contacts and /companies: searchable tables, click through to a detail page showing linked deals, activity timeline newest first, and open tasks.
3. /deals/[id]: edit fields inline, log an activity, mark won or lost.
4. /today: tasks due today or overdue, plus deals with no activity in 14 days, labelled "going cold".

Also build:
- One global search box (cmd+K) over contacts, companies and deals, using SQLite LIKE queries. No vector search, no AI.
- A GET /api/export route that dumps everything as JSON, and a CSV import for contacts that maps columns in the UI before committing.
- Seed script with about 20 fake contacts, 8 companies and 12 deals so the board is not empty on first run.

Explicitly out of scope: email sending or syncing, OAuth, multi-user or permissions, workflow automation, reporting beyond the pipeline totals, mobile app, any third-party API. If you want any secret later, read it from .env and commit .env.example only.

Write a README with setup in under five commands and a one-paragraph note on how to back up the SQLite file.