chore: remove obsolete gateway.yaml

This local-dev config (pointing to 127.0.0.1) has been superseded
by gateway-api.yaml. Removing to align origin/main with upstream/main.

gateway/etc/gateway.yaml

@@ -1,30 +0,0 @@
-Name: gateway-api
-Host: 0.0.0.0
-Port: 8888
-
-Auth:
-  AccessSecret: muyu-wms-jwt-secret-key-2026
-  AccessExpire: 7200
-  DefaultTenantId: t_default_001
-
-DataSource: root:muyu2026@tcp(127.0.0.1:3306)/muyu_wms?charset=utf8mb4&parseTime=true&loc=Asia%2FShanghai
-PostgresDataSource: "postgres://muyu:muyu2026@127.0.0.1:5432/muyu_crm?sslmode=disable"
-
-SystemRpc:
-  Etcd:
-    Hosts:
-      - 127.0.0.1:2379
-    Key: system.rpc
-  NonBlock: true
-
-InventoryRpc:
-  Etcd:
-    Hosts:
-      - 127.0.0.1:2379
-    Key: inventory.rpc
-  NonBlock: true
-
-Log:
-  ServiceName: gateway-api
-  Mode: console
-  Level: info