chore: initial project scaffold with admin web, backend, desktop client, and deployment setup

Add monorepo structure for NexaVPN WireGuard control plane including:
- .gitignore for node_modules, build artifacts, and environment files
- README with project overview, monorepo layout, and quick start guide
- Admin web UI with React, Vite, TypeScript, and nginx reverse proxy
- API client with type definitions for users, devices, policies, gateways, and audit logs
- Admin pages for dashboard, users, devices, policies, g

desktop-client/src-tauri/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "nexavpn-desktop"
+version = "0.1.0"
+description = "NexaVPN desktop client"
+authors = ["NexaVPN"]
+edition = "2021"
+
+[lib]
+name = "nexavpn_desktop"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2.0.2" }
+
+[dependencies]
+base64 = "0.22"
+rand_core = { version = "0.6", features = ["getrandom"] }
+reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tauri = { version = "2.3.1", features = [] }
+x25519-dalek = "2.0"