Initial commit: Visigine (Vite client + Express/SQLite backend)

Container-ready via docker/ compose (frontend nginx + backend Node). Compose adjusted for Coolify on the prod server: frontend uses expose:80 (no host binding — host 8080 is taken by the Coolify proxy; Traefik routes visigine.de), backend ALLOWED_ORIGINS=https://visigine.de. Secrets stay in server/.env (git-ignored); see server/.env.example.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/Navigation/Navigation.jsx

@@ -0,0 +1,43 @@
+import { useState, useEffect } from 'react'
+import { Link } from 'react-router-dom'
+import './Navigation.css'
+
+export default function Navigation() {
+  const [scrolled, setScrolled] = useState(false)
+  const [menuOpen, setMenuOpen] = useState(false)
+
+  useEffect(() => {
+    const onScroll = () => setScrolled(window.scrollY > 40)
+    window.addEventListener('scroll', onScroll, { passive: true })
+    return () => window.removeEventListener('scroll', onScroll)
+  }, [])
+
+  return (
+    <nav className={`nav${scrolled ? ' nav--scrolled' : ''}`}>
+      <div className="nav__inner container">
+        <Link to="/" className="nav__logo">
+          <img src="/profice-logo.png" alt="Profice" className="nav__logo-img" />
+          <span className="nav__logo-name">VISI<em>GINE</em></span>
+        </Link>
+
+        <ul className={`nav__links${menuOpen ? ' nav__links--open' : ''}`}>
+          <li><a href="#features" onClick={() => setMenuOpen(false)}>Features</a></li>
+          <li><a href="#how-it-works" onClick={() => setMenuOpen(false)}>So funktioniert's</a></li>
+          <li><a href="#analyzer" onClick={() => setMenuOpen(false)}>Live-Analyse</a></li>
+          <li><a href="#pricing" onClick={() => setMenuOpen(false)}>Preise</a></li>
+        </ul>
+
+        <div className="nav__actions">
+          <a href="#pricing" className="nav__cta">Analyse starten</a>
+          <button
+            className={`nav__burger${menuOpen ? ' nav__burger--open' : ''}`}
+            aria-label="Menü"
+            onClick={() => setMenuOpen(v => !v)}
+          >
+            <span /><span /><span />
+          </button>
+        </div>
+      </div>
+    </nav>
+  )
+}