refactor: clean up codebase, remove dead code and obsolete docs

Remove influencer-era documentation, unused components, boilerplate
assets, and ghost tiktok cron job. Add supplier invoice management,
document API routes, and PWA icons. Replace boilerplate README.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,36 +1,31 @@
-This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
+# erp-base
+
+Swedish accounting SaaS for sole traders (enskild firma) and limited companies (aktiebolag). Implements double-entry bookkeeping compliant with Swedish accounting law (Bokforingslagen), including VAT handling, tax reporting, and 7-year document retention.
+
+## Tech Stack
+
+- **Framework**: Next.js 16 (App Router), React 19, TypeScript (strict)
+- **Database**: Supabase (PostgreSQL + RLS + magic link auth)
+- **Styling**: Tailwind CSS 4 + shadcn/ui
+- **Hosting**: Vercel
+- **Integrations**: Enable Banking (PSD2), Anthropic SDK, OpenAI (embeddings), Resend (email), web-push (VAPID)
 
 ## Getting Started
 
-First, run the development server:
-
 ```bash
+npm install
 npm run dev
-# or
-yarn dev
-# or
-pnpm dev
-# or
-bun dev
 ```
 
-Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+## Commands
 
-You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+```bash
+npm run dev          # Start development server
+npm run build        # Production build
+npm run lint         # ESLint
+npm test             # Run all Vitest tests
+```
 
-This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
+## Documentation
 
-## Learn More
-
-To learn more about Next.js, take a look at the following resources:
-
-- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
-- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
-
-You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
-
-## Deploy on Vercel
-
-The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
-
-Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.
+See `CLAUDE.md` for comprehensive project documentation including architecture, bookkeeping engine, extension development, and database conventions.