fix(kiro): re-add kiro-auto to registry

Reference: https://github.com/router-for-me/CLIProxyAPIPlus/pull/16
Revert: a594338bc5

internal/registry/model_definitions.go

@@ -1007,6 +1007,18 @@ func GetGitHubCopilotModels() []*ModelInfo {
 func GetKiroModels() []*ModelInfo {
 	return []*ModelInfo{
 		// --- Base Models ---
+		{
+			ID:                  "kiro-auto",
+			Object:              "model",
+			Created:             1732752000,
+			OwnedBy:             "aws",
+			Type:                "kiro",
+			DisplayName:         "Kiro Auto",
+			Description:         "Automatic model selection by Kiro",
+			ContextLength:       200000,
+			MaxCompletionTokens: 64000,
+			Thinking:            &ThinkingSupport{Min: 1024, Max: 32000, ZeroAllowed: true, DynamicAllowed: true},
+		},
 		{
 			ID:                  "kiro-claude-opus-4-5",
 			Object:              "model",