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>

.claude/settings.json

@@ -0,0 +1,13 @@
+{
+  "mcpServers": {
+    "figma": {
+      "type": "http",
+      "url": "https://mcp.figma.com/mcp"
+    },
+    "chrome-devtools": {
+      "type": "stdio",
+      "command": "npx",
+      "args": ["-y", "chrome-devtools-mcp@latest", "--no-usage-statistics", "--isolated"]
+    }
+  }
+}