feat(kimi): add Kimi CLI forward mode support

- Add AccountTypeCLI domain constant
- Add KimiCLIGateway to forward requests through local kimi-cli binary
- Route CLI accounts in ForwardKimiChatCompletions to cli gateway
- Handle CLI type in GetAccessToken (no token needed)
- Fix Gin oneof binding to accept 'cli' type (Create/Update Account)
- Fix validateDataAccount to accept bedrock and cli types
- Remove unsupported --model arg from kimi-cli invocation
- Frontend: CLI account creation UI with model mapping, pool mode
- Frontend: CLI edit modal support
- Frontend: UseKeyModal shows OpenAI examples for kimi platform
- Add i18n strings for CLI account type

[缅因猫/Codex🐾]

backend/internal/service/gateway_service.go

@@ -3454,6 +3454,8 @@ func (s *GatewayService) GetAccessToken(ctx context.Context, account *Account) (
 		return apiKey, "apikey", nil
 	case AccountTypeBedrock:
 		return "", "bedrock", nil // Bedrock 使用 SigV4 签名或 API Key，由 forwardBedrock 处理
+	case AccountTypeCLI:
+		return "", "cli", nil // CLI 类型由 CLI gateway 自行管理认证
 	default:
 		return "", "", fmt.Errorf("unsupported account type: %s", account.Type)
 	}