refactor: add email masking function and enhance RelayInfo logging

This commit introduces a new function, MaskEmail, to mask user email addresses in logs, preventing PII leakage. Additionally, the RelayInfo logging has been updated to utilize this new masking function, ensuring sensitive information is properly handled. The channel test logic has also been improved to dynamically determine the relay format based on the request path.

controller/channel-test.go

@@ -134,7 +134,13 @@ func testChannel(channel *model.Channel, testModel string) testResult {
 	}
 	request := buildTestRequest(testModel)
 
-	info, err := relaycommon.GenRelayInfo(c, types.RelayFormatOpenAI, request, nil)
+	// Determine relay format based on request path
+	relayFormat := types.RelayFormatOpenAI
+	if c.Request.URL.Path == "/v1/embeddings" {
+		relayFormat = types.RelayFormatEmbedding
+	}
+
+	info, err := relaycommon.GenRelayInfo(c, relayFormat, request, nil)
 
 	if err != nil {
 		return testResult{