fix: add ClearAccountAffinity to remaining GatewayCache mock implementations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/internal/service/gateway_multiplatform_test.go

@@ -250,6 +250,9 @@ func (m *mockGatewayCacheForPlatform) GetAccountAffinityClientsBatch(_ context.C
 func (m *mockGatewayCacheForPlatform) GetAccountAffinityClientsWithScores(_ context.Context, _ int64, _ []int64, _ time.Duration) ([]AffinityClient, error) {
 	return nil, nil
 }
+func (m *mockGatewayCacheForPlatform) ClearAccountAffinity(_ context.Context, _ int64, _ []int64) error {
+	return nil
+}
 
 type mockGroupRepoForGateway struct {
 	groups           map[int64]*Group

backend/internal/service/gemini_multiplatform_test.go

@@ -303,6 +303,9 @@ func (m *mockGatewayCacheForGemini) GetAccountAffinityClientsBatch(_ context.Con
 func (m *mockGatewayCacheForGemini) GetAccountAffinityClientsWithScores(_ context.Context, _ int64, _ []int64, _ time.Duration) ([]AffinityClient, error) {
 	return nil, nil
 }
+func (m *mockGatewayCacheForGemini) ClearAccountAffinity(_ context.Context, _ int64, _ []int64) error {
+	return nil
+}
 
 // TestGeminiMessagesCompatService_SelectAccountForModelWithExclusions_GeminiPlatform 测试 Gemini 单平台选择
 func TestGeminiMessagesCompatService_SelectAccountForModelWithExclusions_GeminiPlatform(t *testing.T) {

backend/internal/service/openai_ws_state_store_test.go

@@ -208,6 +208,9 @@ func (c *openAIWSStateStoreTimeoutProbeCache) GetAccountAffinityClientsBatch(_ c
 func (c *openAIWSStateStoreTimeoutProbeCache) GetAccountAffinityClientsWithScores(_ context.Context, _ int64, _ []int64, _ time.Duration) ([]AffinityClient, error) {
 	return nil, nil
 }
+func (c *openAIWSStateStoreTimeoutProbeCache) ClearAccountAffinity(_ context.Context, _ int64, _ []int64) error {
+	return nil
+}
 
 func TestOpenAIWSStateStore_RedisOpsUseShortTimeout(t *testing.T) {
 	probe := &openAIWSStateStoreTimeoutProbeCache{}