Initial commit: Price Hunter — self-hosted price comparison engine

Complete application scaffolding with:
- Backend: Node.js + Fastify + sql.js (SQLite)
- Frontend: SvelteKit + Tailwind CSS
- Scraper engine with parallel fan-out, rate limiting, cheerio-based parsing
- Store management with CSS selector config and per-store test pages
- Docker setup for single-command deployment

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

tests/server/scraper/result-parser.test.ts

@@ -0,0 +1,51 @@
+import { describe, it, expect } from 'vitest';
+import { parsePrice, normalizeUrl } from '../../../src/server/scraper/result-parser.js';
+
+describe('parsePrice', () => {
+  it('parses US format prices', () => {
+    expect(parsePrice('$12.99')).toBe(12.99);
+    expect(parsePrice('$1,299.00')).toBe(1299);
+    expect(parsePrice('$0.50')).toBe(0.5);
+  });
+
+  it('parses European format prices', () => {
+    expect(parsePrice('€12,99')).toBe(12.99);
+    expect(parsePrice('1.299,00 EUR')).toBe(1299);
+    expect(parsePrice('€299,99')).toBe(299.99);
+  });
+
+  it('handles free', () => {
+    expect(parsePrice('free')).toBe(0);
+    expect(parsePrice('FREE')).toBe(0);
+    expect(parsePrice('gratis')).toBe(0);
+  });
+
+  it('handles price ranges', () => {
+    expect(parsePrice('$12 - $15')).toBe(12);
+    expect(parsePrice('€10,00 – €20,00')).toBe(10);
+  });
+
+  it('handles plain numbers', () => {
+    expect(parsePrice('42')).toBe(42);
+    expect(parsePrice('12.99')).toBe(12.99);
+  });
+
+  it('returns null for invalid input', () => {
+    expect(parsePrice('')).toBe(null);
+    expect(parsePrice('abc')).toBe(null);
+  });
+});
+
+describe('normalizeUrl', () => {
+  it('returns absolute URLs as-is', () => {
+    expect(normalizeUrl('https://example.com/product', 'https://base.com')).toBe('https://example.com/product');
+  });
+
+  it('resolves relative URLs against base', () => {
+    expect(normalizeUrl('/products/123', 'https://store.com')).toBe('https://store.com/products/123');
+  });
+
+  it('returns base URL for empty href', () => {
+    expect(normalizeUrl('', 'https://store.com')).toBe('https://store.com');
+  });
+});