feat: initial mono-repo with 30 vanity domain sites

Scaffold complete repo structure:
- 28 static sites extracted from running containers on mlake
- 2 dynamic sites (dasbes.de, dumusst.com) marked for separate handling
- Template system with 6 templates (person-dark/light, product-dark, editorial, fun, minimal)
- Shared CSS (variables, responsive, animations, noise overlay)
- nginx config generator with multi-domain alias support
- Build script with Docker-based nginx validation
- add-site.sh helper for scaffolding new domains
- Dockerfile for single nginx:alpine container

Sites: clemensplassmann.de, danosi.de, deinesei.de, derkaiseristnackt.de,
elefantenhor.de, fragina.de, frenchkis.de, ichbinaufbali.de, ichbinaufbarley.de,
insain.de, julietensity.de, kainco.de (+keinco.de), kainstress.de, keinefreun.de,
knzlmgmt.de, kopffrai.de, legalais.de, machesdocheinfach.de, mai-otto.de
(+otto.flexsiebels.de, ottomatisch.de, ichbinotto.de), martinsiebels.de,
matthiasbreier.de, osterai.de, paragraphenraiter.de, schulfrai.de, smartin3.de,
sorgenfrai.de, vonschraitter.de, wartebitte.de

Refs: otto#341

shared/css/animations.css

@@ -0,0 +1,25 @@
+@keyframes fadeIn {
+  from { opacity: 0; transform: translateY(10px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes fadeInUp {
+  from { opacity: 0; transform: translateY(20px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes glow {
+  0%, 100% { opacity: 0.4; }
+  50% { opacity: 0.8; }
+}
+
+.fade-in {
+  animation: fadeIn 0.6s ease forwards;
+  opacity: 0;
+}
+
+.stagger-1 { animation-delay: 0.1s; }
+.stagger-2 { animation-delay: 0.2s; }
+.stagger-3 { animation-delay: 0.3s; }
+.stagger-4 { animation-delay: 0.4s; }
+.stagger-5 { animation-delay: 0.5s; }

shared/css/noise.css

@@ -0,0 +1,12 @@
+.noise-overlay::before {
+  content: '';
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
+  pointer-events: none;
+  z-index: 1000;
+  opacity: 0.4;
+}

shared/css/responsive.css

@@ -0,0 +1,45 @@
+*, *::before, *::after {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+html {
+  font-size: 16px;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+body {
+  font-family: var(--font-primary);
+  background: var(--bg);
+  color: var(--text);
+  line-height: 1.6;
+  min-height: 100vh;
+}
+
+.container {
+  max-width: var(--max-width);
+  margin: 0 auto;
+  padding: var(--spacing-xl) var(--spacing-lg);
+}
+
+@media (max-width: 768px) {
+  .container {
+    padding: var(--spacing-lg) var(--spacing-md);
+  }
+
+  .grid {
+    grid-template-columns: 1fr !important;
+  }
+}
+
+@media (max-width: 640px) {
+  html {
+    font-size: 15px;
+  }
+
+  .container {
+    padding: var(--spacing-md) var(--spacing-sm);
+  }
+}

shared/css/variables.css

@@ -0,0 +1,24 @@
+:root {
+  /* Theme defaults (overridden per site via inline style) */
+  --bg: #0a0a0c;
+  --bg-elevated: #111115;
+  --bg-card: #16161b;
+  --text: #e8e8ed;
+  --text-dimmed: #6e6e7a;
+  --accent: #c9a84c;
+  --accent-light: rgba(201, 168, 76, 0.1);
+
+  /* Layout */
+  --max-width: 700px;
+  --radius: 8px;
+  --spacing-xs: 4px;
+  --spacing-sm: 8px;
+  --spacing-md: 16px;
+  --spacing-lg: 24px;
+  --spacing-xl: 48px;
+
+  /* Typography */
+  --font-primary: Inter, -apple-system, BlinkMacSystemFont, sans-serif;
+  --font-secondary: Inter, sans-serif;
+  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
+}