feat: add cucumber gherkin-style E2E test framework

- Install @cucumber/cucumber and cucumber-pretty dependencies
- Create Cucumber configuration with tsx loader for TypeScript support
- Add step definitions for common navigation, form interactions, and assertions
- Add authentication step definitions for login/logout flows
- Create feature files for user registration and authentication
- Support multiple auth contexts (player, tournament admin, club admin)
- Configure package.json scripts for running Cucumber tests

Key features:
- Gherkin syntax (Given/When/Then) for behavior-driven testing
- Browser-only interactions (no direct database access)
- Dev site testing (tests run against running dev server)
- Happy path focus for acceptance testing
- Integration with existing TypeScript project

e2e/cucumber/support/world.ts

@@ -0,0 +1,53 @@
+/**
+ * World context for Cucumber tests
+ * Provides shared state between step definitions
+ */
+
+import { Page, BrowserContext, chromium, Browser } from '@playwright/test';
+
+export interface WorldState {
+  page: Page;
+  context: BrowserContext;
+  prisma: any; // Lazy-loaded PrismaClient
+  baseURL: string;
+  user?: {
+    email: string;
+    name: string;
+    password: string;
+  };
+  tournament?: any;
+  player?: any;
+  match?: any;
+}
+
+export class World implements WorldState {
+  page!: Page;
+  context!: BrowserContext;
+  prisma: any;
+  baseURL: string;
+  user?: {
+    email: string;
+    name: string;
+    password: string;
+  };
+  tournament?: any;
+  player?: any;
+  match?: any;
+
+  constructor() {
+    this.baseURL = process.env.BASE_URL || 'http://localhost:3000';
+    this.prisma = null; // Will be lazily loaded when needed
+  }
+
+  async getPrisma() {
+    if (!this.prisma) {
+      // Lazily load PrismaClient when first accessed
+      const { PrismaClient } = await import('@prisma/client');
+      this.prisma = new PrismaClient();
+    }
+    return this.prisma;
+  }
+}
+
+// Export singleton instance
+export const world = new World();