feat: scaffold Antonym fashion store

Anonymous Bitcoin-only fashion e-commerce with:
- Vue 3 + Tailwind 4 frontend with glassmorphism dark/light design system
- Express 5 + SQLite backend with BTCPay Server integration
- Nostr identity (NIP-07/keypair) for anonymous purchase tracking
- ChaCha20-Poly1305 encrypted shipping addresses
- Admin panel with order/product/stock management
- SVG logo splash animation with clip-path reveal
- 5 seeded products across 4 categories

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/vite-env.d.ts

@@ -0,0 +1,12 @@
+/// <reference types="vite/client" />
+
+interface Window {
+  nostr?: {
+    getPublicKey(): Promise<string>
+    signEvent(event: object): Promise<object>
+    nip04?: {
+      encrypt(pubkey: string, plaintext: string): Promise<string>
+      decrypt(pubkey: string, ciphertext: string): Promise<string>
+    }
+  }
+}