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>

server/lib/autofix/robots-txt.js

@@ -0,0 +1,49 @@
+// Generates a robots.txt. Two modes:
+//   'new'  — full file (user has no robots.txt at all)
+//   'diff' — only the bot blocks the user is missing
+import { AI_BOTS } from './extract.js'
+
+function botBlock(bot) {
+  return `User-agent: ${bot}\nAllow: /\nAllow: /llms.txt\n`
+}
+
+export function generateRobotsTxt(siteData) {
+  const { url = '', existingRobots = '', existingAiBots = [] } = siteData
+  const hasRobots = existingRobots.trim().length > 0
+  const sitemap = url ? `${url.replace(/\/$/, '')}/sitemap.xml` : '[Bitte ergänzen: https://deine-domain.de/sitemap.xml]'
+
+  if (!hasRobots) {
+    const header =
+`# robots.txt — generated by VISIGINE
+# ${url || 'https://deine-domain.de'}
+
+User-agent: *
+Allow: /
+
+# AI search engines and language model crawlers
+`
+    const blocks = AI_BOTS.map(botBlock).join('\n')
+    return {
+      content: `${header}${blocks}\nSitemap: ${sitemap}\n`,
+      mode: 'new',
+    }
+  }
+
+  const missing = AI_BOTS.filter((b) => !existingAiBots.includes(b))
+  if (missing.length === 0) {
+    return {
+      content: '# Deine robots.txt deckt bereits alle relevanten KI-Bots ab. Keine Änderungen nötig.\n',
+      mode: 'diff',
+    }
+  }
+
+  const header =
+`# Folgende Blöcke zu deiner bestehenden robots.txt hinzufügen
+# (am Ende der Datei, vor der Sitemap-Zeile falls vorhanden)
+
+`
+  return {
+    content: header + missing.map(botBlock).join('\n'),
+    mode: 'diff',
+  }
+}