fix api config auth and image model compatibility

tests/integration/api/specific/user-preference-art-style-validation.test.ts

@@ -9,6 +9,9 @@ const authMock = vi.hoisted(() => ({
 }))
 
 const prismaMock = vi.hoisted(() => ({
+  user: {
+    findUnique: vi.fn<(...args: unknown[]) => Promise<{ id: string } | null>>(),
+  },
   userPreference: {
     upsert: vi.fn(async () => ({
       userId: 'user-1',
@@ -25,6 +28,7 @@ describe('api specific - user preference art style validation', () => {
 
   beforeEach(() => {
     vi.clearAllMocks()
+    prismaMock.user.findUnique.mockResolvedValue({ id: 'user-1' })
   })
 
   it('accepts valid artStyle and persists normalized value', async () => {
@@ -58,4 +62,27 @@ describe('api specific - user preference art style validation', () => {
     expect(body.error.code).toBe('INVALID_PARAMS')
     expect(prismaMock.userPreference.upsert).not.toHaveBeenCalled()
   })
+
+  it('returns unauthorized when session user record is missing', async () => {
+    prismaMock.user.findUnique.mockResolvedValueOnce(null)
+    const mod = await import('@/app/api/user-preference/route')
+    const req = buildMockRequest({
+      path: '/api/user-preference',
+      method: 'PATCH',
+      body: { artStyle: 'realistic' },
+    })
+
+    const res = await mod.PATCH(req, routeContext)
+    const body = await res.json() as {
+      error?: {
+        code?: string
+        message?: string
+      }
+    }
+
+    expect(res.status).toBe(401)
+    expect(body.error?.code).toBe('UNAUTHORIZED')
+    expect(body.error?.message).toBe('登录状态已失效，请重新登录')
+    expect(prismaMock.userPreference.upsert).not.toHaveBeenCalled()
+  })
 })