feat: add eslint, image upload, tests, splash tagline, security hooks

- Restore CLAUDE.md with project conventions
- ESLint config with vue3-recommended + typescript
- Image upload endpoint (POST /api/admin/upload) with 5MB limit
- Admin product form now supports image upload/preview/removal
- Vitest config + 19 tests (crypto, validation, btcpay webhook, types)
- Restore .claude/ security hooks (block-risky-bash, protect-files)
- Logo splash now shows "EVERYTHING YOU LOVE IS A PSYOP" tagline
- Add .vite/ to gitignore

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

tests/shared/types.test.ts

@@ -0,0 +1,52 @@
+import { describe, it, expect } from 'vitest'
+import type { Product, Order, CartItem, OrderStatus, SizeStock } from '@shared/types'
+
+describe('shared types', () => {
+  it('Product type enforces integer sats', () => {
+    const product: Product = {
+      id: 'test-1',
+      name: 'Test Product',
+      slug: 'test-product',
+      description: 'A test product',
+      priceSats: 100_000,
+      images: ['/images/test.jpg'],
+      sizes: [{ size: 'M', stock: 10 }],
+      category: 'tops',
+      isActive: true,
+      createdAt: '2026-01-01T00:00:00Z',
+      updatedAt: '2026-01-01T00:00:00Z',
+    }
+    expect(product.priceSats).toBe(100_000)
+    expect(Number.isInteger(product.priceSats)).toBe(true)
+  })
+
+  it('CartItem calculates correctly with integer sats', () => {
+    const item: CartItem = {
+      productId: 'test-1',
+      slug: 'test-product',
+      name: 'Test Product',
+      size: 'M',
+      quantity: 3,
+      priceSats: 85_000,
+      image: '/images/test.jpg',
+    }
+    const total = item.priceSats * item.quantity
+    expect(total).toBe(255_000)
+    expect(Number.isInteger(total)).toBe(true)
+  })
+
+  it('OrderStatus has valid values', () => {
+    const statuses: OrderStatus[] = ['pending', 'paid', 'confirmed', 'shipped', 'delivered', 'cancelled']
+    expect(statuses).toHaveLength(6)
+  })
+
+  it('SizeStock tracks integer stock levels', () => {
+    const sizes: SizeStock[] = [
+      { size: 'S', stock: 10 },
+      { size: 'M', stock: 0 },
+    ]
+    const totalStock = sizes.reduce((sum, s) => sum + s.stock, 0)
+    expect(totalStock).toBe(10)
+    expect(sizes[1].stock).toBe(0)
+  })
+})