feat(usage): add support for requested model alias handling

- Introduced methods for setting and retrieving model aliases in execution and usage contexts.
- Enhanced `UsageReporter` and related structures to include client-requested aliases.
- Updated tests to validate alias propagation and ensure correct usage reporting.
- Adjusted metadata handling in CLIProxyAPI executors to address alias integration.

internal/redisqueue/plugin.go

@@ -33,6 +33,10 @@ func (p *usageQueuePlugin) HandleUsage(ctx context.Context, record coreusage.Rec
 	if modelName == "" {
 		modelName = "unknown"
 	}
+	aliasName := strings.TrimSpace(record.Alias)
+	if aliasName == "" {
+		aliasName = modelName
+	}
 	provider := strings.TrimSpace(record.Provider)
 	if provider == "" {
 		provider = "unknown"
@@ -76,6 +80,7 @@ func (p *usageQueuePlugin) HandleUsage(ctx context.Context, record coreusage.Rec
 		requestDetail: detail,
 		Provider:      provider,
 		Model:         modelName,
+		Alias:         aliasName,
 		Endpoint:      resolveEndpoint(ctx),
 		AuthType:      authType,
 		APIKey:        apiKey,
@@ -91,6 +96,7 @@ type queuedUsageDetail struct {
 	requestDetail
 	Provider  string `json:"provider"`
 	Model     string `json:"model"`
+	Alias     string `json:"alias"`
 	Endpoint  string `json:"endpoint"`
 	AuthType  string `json:"auth_type"`
 	APIKey    string `json:"api_key"`

internal/redisqueue/plugin_test.go

@@ -24,6 +24,7 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndSuccess(t *testing.T) {
 		plugin.HandleUsage(ctx, coreusage.Record{
 			Provider:    "openai",
 			Model:       "gpt-5.4",
+			Alias:       "client-gpt",
 			APIKey:      "test-key",
 			AuthIndex:   "0",
 			AuthType:    "apikey",
@@ -40,6 +41,7 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndSuccess(t *testing.T) {
 		payload := popSinglePayload(t)
 		requireStringField(t, payload, "provider", "openai")
 		requireStringField(t, payload, "model", "gpt-5.4")
+		requireStringField(t, payload, "alias", "client-gpt")
 		requireStringField(t, payload, "endpoint", "POST /v1/chat/completions")
 		requireStringField(t, payload, "auth_type", "apikey")
 		requireStringField(t, payload, "request_id", "ctx-request-id")
@@ -58,6 +60,7 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndFailureAndGinRequestID(t
 		plugin.HandleUsage(ctx, coreusage.Record{
 			Provider:    "openai",
 			Model:       "gpt-5.4-mini",
+			Alias:       "client-mini",
 			APIKey:      "test-key",
 			AuthIndex:   "0",
 			AuthType:    "apikey",
@@ -74,6 +77,7 @@ func TestUsageQueuePluginPayloadIncludesStableFieldsAndFailureAndGinRequestID(t
 		payload := popSinglePayload(t)
 		requireStringField(t, payload, "provider", "openai")
 		requireStringField(t, payload, "model", "gpt-5.4-mini")
+		requireStringField(t, payload, "alias", "client-mini")
 		requireStringField(t, payload, "endpoint", "GET /v1/responses")
 		requireStringField(t, payload, "auth_type", "apikey")
 		requireStringField(t, payload, "request_id", "gin-request-id")
@@ -102,6 +106,7 @@ func TestUsageQueuePluginAsyncIgnoresRecycledGinContext(t *testing.T) {
 		mgr.Publish(ctx, coreusage.Record{
 			Provider:    "openai",
 			Model:       "gpt-5.4",
+			Alias:       "client-gpt",
 			APIKey:      "test-key",
 			AuthIndex:   "0",
 			AuthType:    "apikey",
@@ -117,6 +122,7 @@ func TestUsageQueuePluginAsyncIgnoresRecycledGinContext(t *testing.T) {
 
 		payload := waitForSinglePayload(t, 2*time.Second)
 		requireStringField(t, payload, "endpoint", "POST /v1/chat/completions")
+		requireStringField(t, payload, "alias", "client-gpt")
 		requireStringField(t, payload, "request_id", "ctx-request-id")
 		requireBoolField(t, payload, "failed", true)
 	})