v2.0.0 — Web Crypto API Migration & Docker Support

What's New in v2.0.0

🔐 Security

• Migrated from crypto-js to browser-native Web Crypto API (zero dependencies)
• Upgraded encryption from AES-CBC to AES-GCM-256 (authenticated encryption)
• Increased PBKDF2 iterations from legacy to 10,000 rounds
• Fixed critical SQL Injection vulnerability with PDO parameterized queries

🐳 Infrastructure

• Full Docker containerization with multi-stage build
• Automatic database schema initialization via init.sql

⚡ Frontend

• Upgraded to React 19, Vite 6, Tailwind CSS v4, TypeScript 5
• Added fluid page transition animations
• Standardized layout spacing across all states

🧪 Quality

• Added Vitest unit tests for cryptography engine (4 tests, 100% pass)
• ESLint 9 compliance — 0 warnings, 0 errors