fix(api): сохранять большие идентификаторы серверов без округления

backend/src/utils/server-id.test.ts

@@ -0,0 +1,5 @@
+import assert from "node:assert/strict"
+import { parseDbServerId } from "./server-id.js"
+for (const id of [1, "1", "001", " 1 ", 2147483648, "2147483648", Number.MAX_SAFE_INTEGER, String(Number.MAX_SAFE_INTEGER)]) assert.equal(parseDbServerId(id), Number(id))
+for (const id of [undefined, null, false, {}, "", "srv1", "1abc", "1.5", "1e3", "-1", "0", NaN, Infinity, "9007199254740992", "9007199254740993", 9007199254740992, "9223372036854775807"]) assert.equal(parseDbServerId(id), null)
+console.log("server-id: bigint/safe integer IDs preserved; malformed and unsafe IDs rejected without rounding")

backend/src/utils/server-id.ts

@@ -6,5 +6,5 @@ export function parseDbServerId(raw: unknown): number | null {
   const s = String(raw ?? "").trim()
   if (!/^\d+$/.test(s)) return null
   const n = Number.parseInt(s, 10)
-  return Number.isFinite(n) && n >= 1 ? n : null
+  return Number.isSafeInteger(n) && n >= 1 ? n : null
 }