Add full application: receipt scanning, auth, billing, and account deletion

Brings the working codebase (Next.js app, auth system, Stripe billing,
Docker/deploy config, tests, docs) into version control on top of the
placeholder initial commit, and adds account self-deletion (Danger Zone
in Settings, password + typed-email confirmation, cascading DB cleanup,
Stripe cancellation) per GDPR right-to-erasure.

Excludes local build caches, node_modules, and internal agent scratch
files; .gitignore hardened to keep those out going forward.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/fetch_live_store_data.mjs

@@ -0,0 +1,113 @@
+import https from 'https';
+import fs from 'fs';
+
+const EN_KEYWORDS = [
+  'receipt scanner to excel',
+  'receipt to excel',
+  'receipt scanner',
+  'expense tracker',
+  'tax receipt organizer',
+  'receipt keeper',
+  'invoice scanner',
+  'bookkeeping scanner',
+  'ocr receipt scanner',
+  'extract receipt to csv'
+];
+
+const DE_KEYWORDS = [
+  'beleg scanner',
+  'belege digitalisieren',
+  'kassenbon scanner',
+  'quittung scanner',
+  'spesen app',
+  'rechnung scanner',
+  'receipt to excel',
+  'datev scanner',
+  'belegmanager',
+  'ausgaben tracker'
+];
+
+const STOREFRONTS = [
+  { id: 'US', country: 'us', name: 'USA', lang: 'en' },
+  { id: 'GB', country: 'gb', name: 'UK', lang: 'en' },
+  { id: 'CA', country: 'ca', name: 'Kanada', lang: 'en' },
+  { id: 'AU', country: 'au', name: 'Australien', lang: 'en' },
+  { id: 'DE', country: 'de', name: 'Deutschland', lang: 'de' },
+  { id: 'AT', country: 'at', name: 'Österreich', lang: 'de' },
+  { id: 'CH', country: 'ch', name: 'Schweiz', lang: 'de' }
+];
+
+function fetchStoreData(term, country) {
+  return new Promise((resolve) => {
+    const url = `https://itunes.apple.com/search?term=${encodeURIComponent(term)}&country=${country}&entity=software&limit=10`;
+    https.get(url, { headers: { 'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)' } }, (res) => {
+      let data = '';
+      res.on('data', chunk => data += chunk);
+      res.on('end', () => {
+        try {
+          const json = JSON.parse(data);
+          resolve(json.results || []);
+        } catch {
+          resolve([]);
+        }
+      });
+    }).on('error', () => resolve([]));
+  });
+}
+
+function calculateDifficulty(apps, term) {
+  if (!apps || apps.length === 0) return { score: 10, tier: 'Sehr gering' };
+
+  const top5 = apps.slice(0, 5);
+  const totalReviews = top5.reduce((sum, a) => sum + (a.userRatingCount || 0), 0);
+  const avgReviews = totalReviews / top5.length;
+  
+  const titleMatches = top5.filter(a => (a.trackName || '').toLowerCase().includes(term.toLowerCase())).length;
+
+  // Logarithmic scale for reviews
+  let reviewScore = 0;
+  if (avgReviews > 500000) reviewScore = 95;
+  else if (avgReviews > 100000) reviewScore = 85;
+  else if (avgReviews > 20000) reviewScore = 70;
+  else if (avgReviews > 5000) reviewScore = 55;
+  else if (avgReviews > 1000) reviewScore = 40;
+  else if (avgReviews > 100) reviewScore = 25;
+  else reviewScore = 15;
+
+  const matchScore = titleMatches * 5;
+  const finalScore = Math.min(99, Math.max(10, Math.round((reviewScore * 0.8) + (matchScore * 0.2))));
+
+  return {
+    score: finalScore,
+    avgReviews: Math.round(avgReviews),
+    top1: top5[0] ? `${top5[0].trackName} (${top5[0].userRatingCount || 0} rev, ★${top5[0].averageUserRating?.toFixed(1) || '0'})` : 'Keine',
+    resultCount: apps.length
+  };
+}
+
+async function run() {
+  console.log("Starte Live-Abfrage der Apple Storefront API...");
+  const report = {};
+
+  for (const sf of STOREFRONTS) {
+    console.log(`\nPrüfe Storefront: ${sf.name} (${sf.id})...`);
+    report[sf.id] = { name: sf.name, data: [] };
+    const keywords = sf.lang === 'de' ? DE_KEYWORDS : EN_KEYWORDS;
+
+    for (const kw of keywords) {
+      const apps = await fetchStoreData(kw, sf.country);
+      const diff = calculateDifficulty(apps, kw);
+      
+      report[sf.id].data.push({
+        keyword: kw,
+        ...diff
+      });
+      await new Promise(r => setTimeout(r, 200));
+    }
+  }
+
+  fs.writeFileSync('scripts/live_api_results.json', JSON.stringify(report, null, 2));
+  console.log("\nLive-Ergebnisse erfolgreich in scripts/live_api_results.json gespeichert!");
+}
+
+run();