feat: initialisation complète du CORE ProxmoxPanel

Backend Go 1.23+ :
- API REST + WebSocket (chi, gorilla/websocket)
- Authentification PAM via SSH + JWT RS256
- Chiffrement AES-256-GCM pour secrets SQLite
- Pool SSH, client Proxmox REST, hub WebSocket pub/sub
- Système de modules compilés à initialisation conditionnelle
- Audit log, migrations SQLite versionnées

Frontend Vue 3 + Vite + TypeScript :
- Thème Neumorphism sombre/clair (CSS custom properties)
- Wizard d'installation, Dashboard drag-drop, Terminal xterm.js
- Toutes les vues CORE + stubs modules optionnels
- i18n EN/FR (vue-i18n v11)

Infrastructure :
- Docker multi-stage (Go → alpine, Node → nginx)
- docker-compose.yml, .gitattributes, LICENSE MIT, README

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

backend/modules/dashboard/README.md

@@ -0,0 +1,44 @@
+# Module — Dashboard
+
+**Type**: Core (always enabled)
+
+Provides the main dashboard with a configurable, per-user widget grid.
+
+## Features
+
+- Drag-and-drop widget reordering (saved per user in SQLite)
+- Add and remove widgets via modal
+- Widget layout persisted across sessions
+
+## Widget Types
+
+| Type | Description |
+|------|-------------|
+| `shortcut` | Clickable link card (icon + label + URL) |
+| `lxc_status` | Live status of a specific LXC container |
+| `metrics` | Host CPU/RAM/disk summary |
+
+## API Endpoints
+
+| Method | Path | Auth | Description |
+|--------|------|------|-------------|
+| GET | `/api/dashboard/widgets` | JWT | Get current user's widget layout |
+| PUT | `/api/dashboard/widgets` | JWT | Save widget layout |
+
+## Widget Layout Format
+
+```json
+[
+  { "id": "w1", "type": "shortcut", "config": { "label": "Proxmox", "url": "https://proxmox.example.com", "icon": "server" } },
+  { "id": "w2", "type": "lxc_status", "config": { "vmid": 100 } },
+  { "id": "w3", "type": "metrics", "config": {} }
+]
+```
+
+## Database
+
+Layouts are stored in the `user_widgets` table, keyed by user ID.
+
+## License
+
+MIT — see [LICENSE](../../LICENSE)