feat: Pulse CRM Frontend v1.0

Vue 3 + Vite + Tailwind CSS

Views:
- Dashboard mit Stats & Aktivitäten
- Kontakte mit Suche & CRUD
- Firmen mit Cards & CRUD
- Pipeline Kanban Board (Drag & Drop)
- Aktivitäten mit Filter & Timeline
- Settings mit DSGVO-Info

Features:
- Dark Theme (Pulse Design)
- Responsive Layout
- Pinia State Management
- Vue Router mit Guards
- Axios API Client

Task: #13 Frontend UI

public/pulse-icon.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <defs>
+    <linearGradient id="pulse-gradient" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#3b82f6"/>
+      <stop offset="100%" style="stop-color:#1d4ed8"/>
+    </linearGradient>
+  </defs>
+  <rect width="100" height="100" rx="20" fill="url(#pulse-gradient)"/>
+  <path d="M30 50 L45 35 L50 50 L55 25 L60 50 L70 50" stroke="white" stroke-width="6" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
+</svg>