Add dynamic pricing E2E test suite with Playwright

Implement comprehensive E2E tests to validate the surge pricing pipeline:
- Test SimpleSurgePricer with configurable thresholds (high=3, surge=1.5x)
- Verify discount pricing when demand is below low_threshold
- Test multi-product differential pricing based on demand signals
- Validate price propagation from pipeline through Redis to API

Test infrastructure:
- Playwright configuration with custom fixtures
- Python pipeline worker for direct test execution (bypasses Airflow)
- API client for event ingestion and price verification
- Event generator for creating realistic interaction sequences
- docker-compose.e2e.yml with minimal services for testing

e2e/global-setup.ts

@@ -0,0 +1,47 @@
+import { testConfig } from './playwright.config';
+
+/**
+ * Global setup for E2E tests
+ * Verifies all services are healthy before running tests
+ */
+async function globalSetup() {
+  console.log('\n🚀 PHANTOM E2E Test Suite - Global Setup\n');
+
+  // Check backend health
+  await checkService('Backend API', `${testConfig.backendUrl}/health`);
+
+  // Check pricing provider health
+  await checkService('Pricing Provider', `${testConfig.providerUrl}/health`);
+
+  console.log('\n✅ All services healthy. Starting tests...\n');
+}
+
+async function checkService(name: string, url: string): Promise<void> {
+  const maxRetries = 10;
+  const retryDelay = 2000;
+
+  for (let attempt = 1; attempt <= maxRetries; attempt++) {
+    try {
+      const response = await fetch(url);
+      if (response.ok) {
+        const data = await response.json();
+        console.log(`✅ ${name}: healthy`);
+        if (data.redis !== undefined) {
+          console.log(`   └─ Redis: ${data.redis ? 'connected' : 'disconnected'}`);
+        }
+        if (data.kafka !== undefined) {
+          console.log(`   └─ Kafka: ${data.kafka}`);
+        }
+        return;
+      }
+    } catch (error) {
+      if (attempt === maxRetries) {
+        throw new Error(`❌ ${name} is not available at ${url} after ${maxRetries} attempts`);
+      }
+      console.log(`⏳ Waiting for ${name} (attempt ${attempt}/${maxRetries})...`);
+      await new Promise(resolve => setTimeout(resolve, retryDelay));
+    }
+  }
+}
+
+export default globalSetup;