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`.

lib/evaluation-utils.ts

@@ -6,6 +6,7 @@ import {
   UserEvaluation,
   SkillCategory,
 } from "./types";
+import { apiClient } from "../services/api-client";
 
 export function calculateCategoryScore(
   categoryEvaluation: CategoryEvaluation
@@ -44,21 +45,22 @@ export function generateRadarData(
   });
 }
 
-export function saveUserEvaluation(evaluation: UserEvaluation): void {
+export async function saveUserEvaluation(
+  evaluation: UserEvaluation
+): Promise<void> {
   try {
-    localStorage.setItem(
-      "peakSkills_userEvaluation",
-      JSON.stringify(evaluation)
-    );
+    await apiClient.saveUserEvaluation(evaluation);
   } catch (error) {
     console.error("Failed to save user evaluation:", error);
+    throw error;
   }
 }
 
-export function loadUserEvaluation(): UserEvaluation | null {
+export async function loadUserEvaluation(
+  profile: UserEvaluation["profile"]
+): Promise<UserEvaluation | null> {
   try {
-    const saved = localStorage.getItem("peakSkills_userEvaluation");
-    return saved ? JSON.parse(saved) : null;
+    return await apiClient.loadUserEvaluation(profile);
   } catch (error) {
     console.error("Failed to load user evaluation:", error);
     return null;