refactor: centralize domain values and enforce numeric lint

src/integrations/moex/moex.client.ts

@@ -1,5 +1,8 @@
+import { constants as httpStatus } from 'node:http2';
 import { Injectable, ServiceUnavailableException } from '@nestjs/common';
 
+const FALLBACK_PAGE_SIZE = 100;
+
 const baseUrl = 'https://iss.moex.com/iss';
 const timeoutMs = 10_000;
 
@@ -121,8 +124,8 @@ export class MoexClient {
       if (!paginated) return rows;
       const cursorBlock = response[`${block}.cursor`];
       if (!cursorBlock) {
-        if (current.length < 100) return rows;
-        start += 100;
+        if (current.length < FALLBACK_PAGE_SIZE) return rows;
+        start += FALLBACK_PAGE_SIZE;
         continue;
       }
       const cursor = parseRows(cursorBlock)[0];
@@ -145,7 +148,7 @@ export class MoexClient {
       const response = await fetch(url, {
         signal: AbortSignal.timeout(timeoutMs),
       });
-      if (response.status === 404) return null;
+      if (response.status === httpStatus.HTTP_STATUS_NOT_FOUND) return null;
       if (!response.ok) throw new Error(`MOEX HTTP ${response.status}`);
       const body: unknown = await response.json();
       if (!body || typeof body !== 'object')