refactor: restructure repository with separate backend and frontend directories

- Move Java backend to backend/ directory
- Create frontend/ directory for TypeScript TUI and future WebUI
- Update .gitignore for Node.js and worktrees
- Update README.md with new repository structure
- Copy documentation to backend/

README.md

@@ -2,6 +2,20 @@
 
 ERP-System für Fleischereien mit HACCP-Compliance, GoBD-konform, Mehrfilialen-Support.
 
+## Repository Structure
+
+```
+effigenix/
+├── backend/          # Java Spring Boot Backend
+│   ├── src/          # Java source code (DDD + Clean Architecture)
+│   ├── docs/         # Backend documentation
+│   └── pom.xml       # Maven configuration
+│
+└── frontend/         # TypeScript Frontend (TUI & WebUI)
+    ├── apps/         # Applications (CLI TUI, WebUI)
+    └── packages/     # Shared packages (api-client, types, validation)
+```
+
 ## Architektur
 
 **Domain-Driven Design + Clean Architecture + Java 21 + Spring Boot**
@@ -58,14 +72,15 @@ ERP-System für Fleischereien mit HACCP-Compliance, GoBD-konform, Mehrfilialen-S
 
 ## Getting Started
 
-### Prerequisites
+### Backend (Java Spring Boot)
 
+**Prerequisites:**
 - Java 21+
 - Maven 3.9+
 - PostgreSQL 15+
 - Docker (optional, für PostgreSQL)
 
-### Database Setup
+**Database Setup:**
 
 ```bash
 # PostgreSQL mit Docker
@@ -77,9 +92,11 @@ docker run --name effigenix-postgres \
   -d postgres:15
 ```
 
-### Build & Run
+**Build & Run:**
 
 ```bash
+cd backend
+
 # Build
 mvn clean install
 
@@ -90,16 +107,41 @@ mvn spring-boot:run
 mvn spring-boot:run -Dspring-boot.run.profiles=dev
 ```
 
-### API Documentation
+**API Documentation:**
 
 Nach dem Start verfügbar unter:
 - Swagger UI: http://localhost:8080/swagger-ui.html
 - OpenAPI Spec: http://localhost:8080/api-docs
 
+### Frontend (TypeScript TUI)
+
+**Prerequisites:**
+- Node.js 20+
+- pnpm 9+
+
+**Setup & Run:**
+
+```bash
+cd frontend
+
+# Install dependencies
+pnpm install
+
+# Run TUI in dev mode
+pnpm run dev
+
+# Build for production
+pnpm run build
+```
+
+Detailed frontend documentation: [frontend/README.md](frontend/README.md)
+
 ## Project Structure
 
+**Backend (Java):**
+
 ```
-src/main/java/com/effigenix/
+backend/src/main/java/de/effigenix/
 ├── domain/              # Domain Layer (keine Framework-Dependencies!)
 │   └── usermanagement/
 │       ├── User.java
@@ -120,8 +162,27 @@ src/main/java/com/effigenix/
     ├── security/        # AuthorizationPort, Action
     └── common/          # Result, ApplicationError
 
-src/main/resources/
-└── db/migration/        # Flyway Migrations
+backend/src/main/resources/
+└── db/migration/        # Liquibase Migrations
+```
+
+**Frontend (TypeScript):**
+
+```
+frontend/
+├── apps/
+│   └── cli/             # Terminal UI (Ink)
+│       ├── src/
+│       │   ├── components/  # UI components
+│       │   ├── hooks/       # React hooks
+│       │   └── state/       # State management
+│       └── package.json
+│
+└── packages/            # Shared packages (reusable for WebUI)
+    ├── api-client/      # HTTP client für Backend API
+    ├── types/           # TypeScript types (generated from OpenAPI)
+    ├── validation/      # Zod schemas
+    └── config/          # Shared configuration
 ```
 
 ## User Management (Generic Subdomain)
@@ -166,7 +227,11 @@ public class CreateRecipe {
 
 ## Testing
 
+**Backend:**
+
 ```bash
+cd backend
+
 # Unit Tests
 mvn test
 
@@ -177,6 +242,21 @@ mvn verify
 mvn clean verify jacoco:report
 ```
 
+**Frontend:**
+
+```bash
+cd frontend
+
+# Unit Tests
+pnpm test
+
+# Test Coverage
+pnpm run test:coverage
+
+# Type Check
+pnpm run typecheck
+```
+
 ## License
 
 Proprietary - Effigenix GmbH