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>

server/routes/admin.ts

@@ -0,0 +1,22 @@
+import { Router } from 'express'
+import { rateLimit, createSession, deleteSession, verifyPassword, adminAuth } from '../middleware/adminAuth.js'
+import { requireBody } from '../middleware/validate.js'
+
+export const adminRouter = Router()
+
+adminRouter.post('/login', rateLimit, requireBody('password'), (req, res) => {
+  const { password } = req.body as { password: string }
+  if (!verifyPassword(password)) { res.status(401).json({ error: { code: 'INVALID_PASSWORD', message: 'Invalid password' } }); return }
+  const token = createSession()
+  res.cookie('admin_session', token, { httpOnly: true, sameSite: 'strict', secure: process.env.NODE_ENV === 'production', maxAge: 24 * 60 * 60 * 1000 })
+  res.json({ ok: true })
+})
+
+adminRouter.post('/logout', adminAuth, (req, res) => {
+  const token = req.cookies?.admin_session
+  if (token) deleteSession(token)
+  res.clearCookie('admin_session')
+  res.json({ ok: true })
+})
+
+adminRouter.get('/verify', adminAuth, (_req, res) => { res.json({ ok: true }) })