Documentation of central architectural decisions

The following decisions were discussed and carefully decided by the team through the course of the project.

(DONE) Runtime and programming language

• Runtime will be nodejs (at least 24.1.0)
• Programming language will be TypeScript (at least 5.8.3)

(DONE) Framework and libraries

• (DONE) Fullstack-Framework: SvelteKit

• (DONE) UI Components: Bits UI

• (DONE) Database and ORM: Drizzle with PostgreSQL

• (DONE) Validation: zod

• (DONE) Hashing: Argon2id via argon2 (node), argon2-browser (WASM, Browser), @noble/hashes (Pure JS Fallback)

• (DONE) Synchronous Encryption for data encryption: AES256 via crypto (node), Web Crypto API (Browser)

• (DONE) Asynchronous Encryption for key exchange: Crystal KYBER via @noble/post-quantum

• (DONE) Shamir's secret sharing: secrets.js-34r7h

• (DONE) Unit testing: vitest

• (DONE) E2E testing: playwright