fix api config auth and image model compatibility

tests/integration/api/specific/user-api-config-put.test.ts

@@ -34,6 +34,9 @@ type SavedProvider = {
 }
 
 const prismaMock = vi.hoisted(() => ({
+  user: {
+    findUnique: vi.fn<(...args: unknown[]) => Promise<{ id: string } | null>>(),
+  },
   userPreference: {
     findUnique: vi.fn<(...args: unknown[]) => Promise<UserPreferenceSnapshot | null>>(),
     upsert: vi.fn<(...args: unknown[]) => Promise<unknown>>(),
@@ -103,6 +106,7 @@ describe('api specific - user api-config PUT provider uniqueness', () => {
     vi.clearAllMocks()
     resetAuthMockState()
 
+    prismaMock.user.findUnique.mockResolvedValue({ id: 'user-1' })
     prismaMock.userPreference.findUnique.mockResolvedValue({
       customProviders: null,
       customModels: null,
@@ -111,6 +115,37 @@ describe('api specific - user api-config PUT provider uniqueness', () => {
     getBillingModeMock.mockResolvedValue('OFF')
   })
 
+  it('returns unauthorized when session user no longer exists before saving providers', async () => {
+    installAuthMocks()
+    mockAuthenticated('user-missing')
+    prismaMock.user.findUnique.mockResolvedValueOnce(null)
+    const route = await import('@/app/api/user/api-config/route')
+
+    const req = buildMockRequest({
+      path: '/api/user/api-config',
+      method: 'PUT',
+      body: {
+        providers: [
+          { id: 'openai-compatible:oa-1', name: 'OpenAI A', baseUrl: 'https://oa-a.test', apiKey: 'oa-key-a' },
+        ],
+      },
+    })
+
+    const res = await route.PUT(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.findUnique).not.toHaveBeenCalled()
+    expect(prismaMock.userPreference.upsert).not.toHaveBeenCalled()
+  })
+
   it('allows multiple providers with the same api type when provider ids differ', async () => {
     installAuthMocks()
     mockAuthenticated('user-1')