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/analyze_zimmerpflanze.mjs

@@ -0,0 +1,63 @@
+import https from 'https';
+
+const keywords = [
+  'zimmerpflanze',
+  'zimmerpflanzen',
+  'zimmerpflanzen pflege',
+  'pflanzen bestimmen',
+  'pflanzen app',
+  'pflanzendoktor',
+  'pflanzen gießen erinnerung',
+  'houseplant',
+  'plant care'
+];
+
+const storefronts = [
+  { code: 'de', name: 'Deutschland' },
+  { code: 'at', name: 'Österreich' },
+  { code: 'ch', name: 'Schweiz' }
+];
+
+function fetchSearch(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' } }, (res) => {
+      let data = '';
+      res.on('data', chunk => data += chunk);
+      res.on('end', () => {
+        try {
+          resolve(JSON.parse(data).results || []);
+        } catch {
+          resolve([]);
+        }
+      });
+    }).on('error', () => resolve([]));
+  });
+}
+
+async function run() {
+  console.log("Analysiere 'Zimmerpflanze' und verwandte Keywords im App Store...\n");
+
+  for (const sf of storefronts) {
+    console.log(`========================================`);
+    console.log(`Storefront: ${sf.name} (${sf.code.toUpperCase()})`);
+    console.log(`========================================`);
+
+    for (const kw of keywords) {
+      const apps = await fetchSearch(kw, sf.code);
+      const top5 = apps.slice(0, 5);
+      const avgReviews = top5.length ? Math.round(top5.reduce((s, a) => s + (a.userRatingCount || 0), 0) / top5.length) : 0;
+      const top1 = top5[0] || {};
+      
+      console.log(`\nKeyword: "${kw}"`);
+      console.log(`- Apps gefunden: ${apps.length}`);
+      console.log(`- Top 1: ${top1.trackName || 'Keine'} (${top1.userRatingCount || 0} Reviews, ★${top1.averageUserRating?.toFixed(1) || 0})`);
+      console.log(`- Ø Reviews Top 5: ${avgReviews.toLocaleString('de-DE')}`);
+      
+      await new Promise(r => setTimeout(r, 150));
+    }
+    console.log("\n");
+  }
+}
+
+run();