Initial Ralph scaffold

docs/tech-stack.md

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+# Tech Stack
+
+- **Language**: TypeScript
+- **Runtime**: Node.js 20
+- **Framework**: NestJS 10
+- **Testing**: Jest (backend), Vitest (frontend)
+- **Build Tool**: Docker Compose, pnpm workspaces, tsup
+
+## Libraries
+
+- TypeORM
+- PostgreSQL
+- @nestjs/jwt
+- @nestjs/passport
+- @nestjs/websockets
+- @nestjs/platform-socket.io
+- @nestjs/schedule
+- @nestjs/config
+- class-validator
+- class-transformer
+- bcrypt
+- date-fns
+- ical.js
+- node-caldav
+- @microsoft/microsoft-graph-client
+- imap
+- axios
+- bull
+- ioredis
+- helmet
+- express-rate-limit
+- React 18
+- Vite 5
+- React Router
+- TanStack Query (React Query)
+- Zustand
+- FullCalendar
+- react-beautiful-dnd
+- socket.io-client
+- date-fns
+- React Hook Form
+- Zod
+- TailwindCSS
+- Radix UI