feat: initial IPFS Portal — Next.js frontend for remote IPFS node management

Multi-file upload with Quick Upload + Crypto Payment tabs.
Dashboard with live IPFS metrics, Explorer, Peers, Pins, History, Settings pages.
Docker deploy (standalone output), full test suite (16 Playwright tests).
Payment integration via IPFSPortalPayment + MockUSDC contracts on zkSync.

.gitignore

@@ -0,0 +1,32 @@
+# Dependencies
+node_modules/
+
+# Next.js
+.next/
+out/
+
+# Environment
+.env
+.env.local
+.env.production
+
+# Logs
+*.log
+
+# Test outputs
+test-results/
+playwright-report/
+
+# Build artifacts
+tsconfig.tsbuildinfo
+next-env.d.ts
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db