refactor: separate aircraft and vessel server providers

server/providers/common/query.js

@@ -0,0 +1,12 @@
+export function requiredFiniteQueryNumber(params, key) {
+  const value = params.get(key);
+  if (value === null || value.trim() === '') return null;
+  const number = Number(value);
+  return Number.isFinite(number) ? number : null;
+}
+
+export function clampInt(value, min, max, fallback) {
+  const number = Number.parseInt(value, 10);
+  if (!Number.isFinite(number)) return fallback;
+  return Math.max(min, Math.min(max, number));
+}