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/check_luna.mjs

@@ -0,0 +1,30 @@
+import fs from "fs";
+
+const envContent = fs.readFileSync(".env.local", "utf-8");
+const apiKeyMatch = envContent.match(/OPENROUTER_API_KEY=([^\r\n]+)/);
+const apiKey = apiKeyMatch ? apiKeyMatch[1].trim() : "";
+
+async function checkLuna56() {
+  const res = await fetch("https://openrouter.ai/api/v1/models", {
+    headers: { "Authorization": `Bearer ${apiKey}` }
+  });
+  const data = await res.json();
+  const models = data.data || [];
+
+  const matches = models.filter(m => 
+    m.id.toLowerCase().includes("5.6") || 
+    m.id.toLowerCase().includes("luna") ||
+    m.name.toLowerCase().includes("5.6") ||
+    m.name.toLowerCase().includes("luna")
+  );
+
+  console.log("=== MATCHES FOR '5.6' / 'LUNA' ===");
+  matches.forEach(m => {
+    console.log(`- ID: ${m.id}`);
+    console.log(`  Name: ${m.name}`);
+    console.log(`  Modalities: ${JSON.stringify(m.architecture?.modality || 'unknown')}`);
+    console.log(`  Pricing: ${JSON.stringify(m.pricing)}`);
+  });
+}
+
+checkLuna56().catch(console.error);