fix(frontend): relax system import limits

frontend/src/views/admin/system-settings/__tests__/useConfigExportImport.spec.ts

@@ -0,0 +1,76 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { ref } from 'vue'
+
+const { errorMock, successMock } = vi.hoisted(() => ({
+  errorMock: vi.fn(),
+  successMock: vi.fn(),
+}))
+
+vi.mock('@/composables/useToast', () => ({
+  useToast: () => ({
+    error: errorMock,
+    success: successMock,
+  }),
+}))
+
+vi.mock('@/api/admin', () => ({
+  adminApi: {},
+}))
+
+import { useConfigExportImport } from '../composables/useConfigExportImport'
+
+function buildFileInputEvent(file: File): Event {
+  return {
+    target: {
+      files: [file],
+      value: 'selected.json',
+    },
+  } as unknown as Event
+}
+
+function makeSizedFile(content: string, size: number): File {
+  const file = new File([content], 'config.json', { type: 'application/json' })
+  Object.defineProperty(file, 'size', { value: size })
+  return file
+}
+
+describe('useConfigExportImport file size limits', () => {
+  beforeEach(() => {
+    errorMock.mockReset()
+    successMock.mockReset()
+  })
+
+  it('accepts config import files larger than the old 10MB limit', async () => {
+    const state = useConfigExportImport(ref({ site_name: 'Aether' }))
+    const file = makeSizedFile(
+      JSON.stringify({
+        version: '1',
+        exported_at: '2026-01-01T00:00:00.000Z',
+        global_models: [],
+        providers: [],
+      }),
+      11 * 1024 * 1024
+    )
+
+    state.handleConfigFileSelect(buildFileInputEvent(file))
+    await vi.waitFor(() => expect(state.importDialogOpen.value).toBe(true))
+
+    expect(errorMock).not.toHaveBeenCalledWith('文件大小不能超过 10MB')
+    expect(state.importPreview.value).toEqual({
+      version: '1',
+      exported_at: '2026-01-01T00:00:00.000Z',
+      global_models: [],
+      providers: [],
+    })
+    expect(state.importDialogOpen.value).toBe(true)
+  })
+
+  it('shows the updated config import limit when the file is too large', () => {
+    const state = useConfigExportImport(ref({ site_name: 'Aether' }))
+    const file = makeSizedFile('{}', 501 * 1024 * 1024)
+
+    state.handleConfigFileSelect(buildFileInputEvent(file))
+
+    expect(errorMock).toHaveBeenCalledWith('文件大小不能超过 500MB')
+  })
+})