feat: add fullstack TypeScript template with Docker support

- Created package.json for managing workspaces (frontend and backend)
- Added scripts for development, build, testing, and Docker operations
- Implemented kill-dev-processes.sh script to terminate development processes gracefully

frontend/Dockerfile.dev

@@ -0,0 +1,17 @@
+# Frontend Development Dockerfile
+FROM node:18-alpine
+
+WORKDIR /app
+
+# Package files kopieren
+COPY package*.json ./
+RUN npm ci
+
+# Source code kopieren
+COPY . .
+
+# Port exposieren
+EXPOSE 3000
+
+# Development server starten
+CMD ["npm", "start"]