fix(test): update MockPIIInitializer signature to match interface

Update MockPIIInitializer.Init() to include numClasses parameter
to match the PIIInitializer interface changes.

This fixes the CI test failure where the mock didn't properly
implement the updated interface signature.

Signed-off-by: Yossi Ovadia <[email protected]>

Author: yossiovadia

src/semantic-router/pkg/classification/classifier_test.go

@@ -718,7 +718,9 @@ var _ = Describe("jailbreak detection", func() {
 
 type MockPIIInitializer struct{ InitError error }
 
-func (m *MockPIIInitializer) Init(_ string, useCPU bool) error { return m.InitError }
+func (m *MockPIIInitializer) Init(_ string, useCPU bool, numClasses int) error {
+	return m.InitError
+}
 
 type MockPIIInferenceResponse struct {
 	classifyTokensResult candle_binding.TokenClassificationResult