feat: scraper registry + adapter interface

tests/scrapers/registry.test.ts

@@ -0,0 +1,24 @@
+import { describe, it, expect, vi } from 'vitest'
+import { scrapeUrl, registerScraperForTest, resetScrapersForTest } from '@/lib/scrapers'
+import type { PriceScraper } from '@/lib/scrapers/types'
+
+describe('scrapeUrl', () => {
+  it('dispatches to matching shop scraper', async () => {
+    const fake: PriceScraper = {
+      shop: 'geizhals',
+      scrape: vi.fn().mockResolvedValue({
+        price: 42, currency: 'EUR', availability: 'in_stock', name: 'X',
+      }),
+    }
+    resetScrapersForTest()
+    registerScraperForTest(fake)
+    const result = await scrapeUrl('https://geizhals.de/foo')
+    expect(result.price).toBe(42)
+    expect(fake.scrape).toHaveBeenCalledWith('https://geizhals.de/foo')
+  })
+
+  it('throws on unknown shop', async () => {
+    resetScrapersForTest()
+    await expect(scrapeUrl('https://example.com')).rejects.toThrow(/unsupported/i)
+  })
+})