Install authentication dependencies: next-auth@5, bcryptjs, @types/bcryptjs

Add required npm packages for user authentication implementation:
- next-auth@5.0.0-beta.30: Next.js authentication library
- bcryptjs@3.0.3: Password hashing library
- @types/bcryptjs@2.4.6: TypeScript types for bcryptjs

Mark task 1.1 as complete.

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

package.json

@@ -19,12 +19,15 @@
     "@radix-ui/react-label": "^2.1.8",
     "@radix-ui/react-select": "^2.2.6",
     "@radix-ui/react-slider": "^1.3.6",
+    "@types/bcryptjs": "^2.4.6",
+    "bcryptjs": "^3.0.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "drizzle-orm": "^0.45.1",
     "lightweight-charts": "^4.2.3",
     "lucide-react": "^0.563.0",
     "next": "^16.1.6",
+    "next-auth": "^5.0.0-beta.30",
     "next-themes": "^0.4.6",
     "papaparse": "^5.5.3",
     "pg": "^8.13.1",