Refactor evaluation and admin pages to use server actions for data fetching, enhancing performance and simplifying state management. Update README to reflect API route changes and remove deprecated API endpoints for users and evaluations.

src/lib/evaluation-access.ts

@@ -0,0 +1,19 @@
+import { prisma } from "@/lib/db";
+
+export async function canAccessEvaluation(
+  evaluationId: string,
+  userId: string,
+  isAdmin: boolean,
+  readOnly = false
+) {
+  if (isAdmin) return true;
+  const eval_ = await prisma.evaluation.findUnique({
+    where: { id: evaluationId },
+    select: { evaluatorId: true, isPublic: true, sharedWith: { select: { userId: true } } },
+  });
+  if (!eval_) return false;
+  if (eval_.evaluatorId === userId) return true;
+  if (eval_.sharedWith.some((s) => s.userId === userId)) return true;
+  if (readOnly && eval_.isPublic) return true;
+  return false;
+}