Create Dashboard Layout

# 🧠 Concept
Provide a consistent navigation structure.

## ⚠️ Problem
Users need intuitive navigation between monitoring features.

## 📁 Implementation Scope
- apps/web/components/layout/

## ✅ Requirements
- Sidebar navigation
- Top navigation
- Responsive layout

## 🎯 Acceptance Criteria
- [ ] Sidebar implemented
- [ ] Header implemented
- [ ] Mobile responsiveness verified