fix(api): увеличить лимит размера тела запроса и улучшить обработку URL для API

shared/api/system-database.ts

@@ -1,9 +1,19 @@
 import { ApiClientError } from "@/shared/api/http-client"
+import { configuredBackendUrl } from "@/lib/backend-url"
+
+const MAX_RESTORE_BYTES = 512 * 1024 * 1024
 
 function trimBaseUrl(baseUrl: string): string {
   return baseUrl.replace(/\/$/, "")
 }
 
+function resolveDatabaseApiUrl(baseUrl: string, path: string): string {
+  if (configuredBackendUrl().kind === "same-origin") {
+    return path
+  }
+  return `${trimBaseUrl(baseUrl)}${path}`
+}
+
 function parseFilename(contentDisposition: string | null, fallback: string): string {
   if (!contentDisposition) return fallback
   const utfMatch = /filename\*=UTF-8''([^;]+)/i.exec(contentDisposition)
@@ -22,7 +32,7 @@ function parseFilename(contentDisposition: string | null, fallback: string): str
 export async function downloadSystemDatabaseBackup(
   baseUrl: string,
 ): Promise<{ blob: Blob; filename: string }> {
-  const res = await fetch(`${trimBaseUrl(baseUrl)}/api/system/database/backup`)
+  const res = await fetch(resolveDatabaseApiUrl(baseUrl, "/api/system/database/backup"))
   if (!res.ok) {
     const payload = await res.json().catch(() => undefined)
     const msg =
@@ -40,8 +50,14 @@ export async function downloadSystemDatabaseBackup(
 }
 
 export async function restoreSystemDatabaseBackup(baseUrl: string, file: File): Promise<void> {
+  if (file.size > MAX_RESTORE_BYTES) {
+    throw new ApiClientError(
+      `Файл больше ${MAX_RESTORE_BYTES / (1024 * 1024)} МБ — уменьшите бэкап или обратитесь к администратору`,
+      413,
+    )
+  }
   const body = await file.arrayBuffer()
-  const res = await fetch(`${trimBaseUrl(baseUrl)}/api/system/database/restore`, {
+  const res = await fetch(resolveDatabaseApiUrl(baseUrl, "/api/system/database/restore"), {
     method: "POST",
     headers: { "Content-Type": "application/octet-stream" },
     body,