Initial marketplace implementation

Full-stack marketplace for buying/selling second-hand items.
React 19 + TypeScript + Tailwind CSS v4 frontend with 17 screens,
Express + Prisma + Socket.io backend, Stripe payments, JWT auth.

Deployed at https://marketplace.173.212.212.157.sslip.io/

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/validators/auth.ts

@@ -0,0 +1,12 @@
+import { z } from 'zod';
+
+export const registerSchema = z.object({
+  fullName: z.string().min(2, 'Name must be at least 2 characters'),
+  email: z.string().email('Invalid email address'),
+  password: z.string().min(8, 'Password must be at least 8 characters'),
+});
+
+export const loginSchema = z.object({
+  email: z.string().email('Invalid email address'),
+  password: z.string().min(1, 'Password is required'),
+});