Initial scaffold: full-stack mRemotify monorepo

Sets up the complete mRemotify project — a browser-based remote
connection manager — with a working pnpm workspace monorepo:

Frontend (React + TypeScript + Vite + Ant Design 5):
- Login page with JWT auth
- Resizable sidebar with drag-and-drop connection tree (folders + connections)
- Tabbed session area (SSH via xterm.js, RDP via guacamole-common-js)
- Connection CRUD modal with SSH/RDP-specific fields
- Zustand store for auth, tree data, and open sessions

Backend (Fastify + TypeScript + Prisma + PostgreSQL):
- JWT authentication (login + /me endpoint)
- Full CRUD REST API for folders (self-referencing) and connections
- AES-256-CBC password encryption at rest
- WebSocket proxy for SSH sessions (ssh2 <-> xterm.js)
- WebSocket proxy for RDP sessions (guacd TCP handshake + bidirectional relay)
- Admin user seeding on first start

Infrastructure:
- Docker Compose: postgres (healthcheck) + guacd + backend + frontend/nginx
- nginx: serves SPA, proxies /api and /ws (with WebSocket upgrade) to backend
- .env.example with all required variables documented

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

.env.example

@@ -0,0 +1,19 @@
+# PostgreSQL connection URL
+POSTGRES_URL=postgresql://mremotify:mremotify@localhost:5432/mremotify
+
+# AES-256 encryption key for passwords (must be exactly 32 characters)
+ENCRYPTION_KEY=change-me-to-a-random-32char-key!
+
+# JWT signing secret
+JWT_SECRET=change-me-to-a-secure-jwt-secret
+
+# Default admin credentials (used during first-time seeding)
+ADMIN_USER=admin
+ADMIN_PASSWORD=admin123
+
+# Apache Guacamole daemon
+GUACD_HOST=guacd
+GUACD_PORT=4822
+
+# Backend port
+PORT=3000