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/summary.js

@@ -0,0 +1,42 @@
+const SUMMARY_PROMPT = `You are a GEO/SEO auditor. The following checks were run on a website. Some FAILED.
+Write a summary in German: 1-2 sentences describing what is missing and why it matters for AI visibility.
+Be specific about which signals are missing. Do not invent checks — only describe the ones listed.
+Return ONLY the summary text, no JSON, no markdown.`
+
+function fallback(failedTitles) {
+  return `${failedTitles.length} GEO/SEO-Signale fehlen. Behebe die aufgelisteten Probleme für bessere KI-Sichtbarkeit.`
+}
+
+export async function generateSummary(failedTitles, targetUrl) {
+  const apiKey = process.env.MISTRAL_KEY
+  if (!apiKey || failedTitles.length === 0) return fallback(failedTitles)
+
+  const controller = new AbortController()
+  const timer = setTimeout(() => controller.abort(), 10000)
+  try {
+    const res = await fetch('https://api.mistral.ai/v1/chat/completions', {
+      method: 'POST',
+      signal: controller.signal,
+      headers: {
+        'Content-Type': 'application/json',
+        Authorization: `Bearer ${apiKey}`,
+      },
+      body: JSON.stringify({
+        model: 'mistral-large-latest',
+        max_tokens: 150,
+        messages: [
+          { role: 'system', content: SUMMARY_PROMPT },
+          { role: 'user', content: `Website: ${targetUrl}\nFehlende Signale: ${failedTitles.join(', ')}` },
+        ],
+      }),
+    })
+    if (!res.ok) return fallback(failedTitles)
+    const data = await res.json()
+    const text = (data?.choices?.[0]?.message?.content || '').trim()
+    return text || fallback(failedTitles)
+  } catch {
+    return fallback(failedTitles)
+  } finally {
+    clearTimeout(timer)
+  }
+}