Initial CloudLink scaffold: E2E encrypted PWA with messaging and cloud drive

- Zero-knowledge architecture: all encryption/decryption client-side via Web Crypto API
- AES-GCM 256 for messages, files, and key wrapping; PBKDF2 for password-based key derivation
- Node.js/TypeScript backend: JWT auth with refresh rotation, argon2id passwords, TOTP 2FA
- PostgreSQL schema: encrypted blobs only, server never stores plaintext
- Real-time messaging via WebSocket relay (server routes ciphertext, cannot read it)
- Encrypted file upload/download with per-file keys wrapped by user master key
- React PWA frontend: Vite + Tailwind + service worker for offline support
- Docker Compose: postgres + backend + frontend + nginx with TLS

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

backend/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "CommonJS",
+    "moduleResolution": "node",
+    "strict": true,
+    "esModuleInterop": true,
+    "outDir": "dist",
+    "rootDir": "src",
+    "skipLibCheck": true
+  },
+  "include": ["src"]
+}