fix: list permanent whitelist entries sorted by creation time

Update ListPermEntries to return entry field instead of ip and
sort results by created_at. Update the handler in auth.go to call
ListPermEntries instead of ListTempEntries for the whitelist endpoint.

auth.go

@@ -76,7 +76,7 @@ func whitelistListHandler(cfg Config, db *sql.DB) http.HandlerFunc {
 			http.Error(w, "unauthorized", http.StatusUnauthorized)
 			return
 		}
-		entries, err := ListTempEntries(db)
+		entries, err := ListPermEntries(db)
 		if err != nil {
 			http.Error(w, "database error", http.StatusInternalServerError)
 			return