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.

sdk/cliproxy/auth/conductor_oauth_alias_suspension_test.go

@@ -10,20 +10,23 @@ import (
 	internalconfig "github.com/router-for-me/CLIProxyAPI/v6/internal/config"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/registry"
 	cliproxyexecutor "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/executor"
+	coreusage "github.com/router-for-me/CLIProxyAPI/v6/sdk/cliproxy/usage"
 )
 
 type aliasRoutingExecutor struct {
 	id string
 
-	mu            sync.Mutex
-	executeModels []string
+	mu             sync.Mutex
+	executeModels  []string
+	executeAliases []string
 }
 
 func (e *aliasRoutingExecutor) Identifier() string { return e.id }
 
-func (e *aliasRoutingExecutor) Execute(_ context.Context, _ *Auth, req cliproxyexecutor.Request, _ cliproxyexecutor.Options) (cliproxyexecutor.Response, error) {
+func (e *aliasRoutingExecutor) Execute(ctx context.Context, _ *Auth, req cliproxyexecutor.Request, _ cliproxyexecutor.Options) (cliproxyexecutor.Response, error) {
 	e.mu.Lock()
 	e.executeModels = append(e.executeModels, req.Model)
+	e.executeAliases = append(e.executeAliases, coreusage.RequestedModelAliasFromContext(ctx))
 	e.mu.Unlock()
 	return cliproxyexecutor.Response{Payload: []byte(req.Model)}, nil
 }
@@ -52,6 +55,14 @@ func (e *aliasRoutingExecutor) ExecuteModels() []string {
 	return out
 }
 
+func (e *aliasRoutingExecutor) ExecuteAliases() []string {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+	out := make([]string, len(e.executeAliases))
+	copy(out, e.executeAliases)
+	return out
+}
+
 func TestManagerExecute_OAuthAliasBypassesBlockedRouteModel(t *testing.T) {
 	const (
 		provider    = "antigravity"
@@ -108,4 +119,12 @@ func TestManagerExecute_OAuthAliasBypassesBlockedRouteModel(t *testing.T) {
 	if gotModels[0] != targetModel {
 		t.Fatalf("execute model = %q, want %q", gotModels[0], targetModel)
 	}
+
+	gotAliases := executor.ExecuteAliases()
+	if len(gotAliases) != 1 {
+		t.Fatalf("execute aliases len = %d, want 1", len(gotAliases))
+	}
+	if gotAliases[0] != routeModel {
+		t.Fatalf("execute alias = %q, want %q", gotAliases[0], routeModel)
+	}
 }