feat: add PostgreSQL support and enhance evaluation loading

- Added `pg` and `@types/pg` dependencies for PostgreSQL integration.
- Updated `useEvaluation` hook to load user evaluations from the API, improving data management.
- Refactored `saveUserEvaluation` and `loadUserEvaluation` functions to interact with the API instead of localStorage.
- Introduced error handling for profile loading and evaluation saving to enhance robustness.
- Added new methods for managing user profiles and evaluations, including `clearUserProfile` and `loadEvaluationForProfile`.

package.json

@@ -62,7 +62,9 @@
     "tailwind-merge": "^2.5.5",
     "tailwindcss-animate": "^1.0.7",
     "vaul": "^0.9.9",
-    "zod": "3.25.67"
+    "zod": "3.25.67",
+    "pg": "^8.12.0",
+    "@types/pg": "^8.11.10"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.9",