feat: implement user profile retrieval with roles and permissions caching

db/queries/permission.sql

@@ -0,0 +1,6 @@
+-- name: GetPermissionsByUserID :many
+SELECT DISTINCT p.name, p.description
+FROM user_roles ur
+JOIN role_permissions rp ON rp.role_id = ur.role_id
+JOIN permissions p ON p.id = rp.permission_id
+WHERE ur.user_id = sqlc.arg(user_id);