fix(platform): move gateway and namespace into manifests/ directory

cluster/platform/gateway-api/manifests/gateway.yaml

@@ -0,0 +1,54 @@
+# ------------------------------------------------------------------------------
+# GatewayClass — tells Kubernetes that Cilium handles Gateway resources
+# Defined here alongside the Gateway it enables
+# ------------------------------------------------------------------------------
+apiVersion: gateway.networking.k8s.io/v1
+kind: GatewayClass
+metadata:
+  name: cilium
+spec:
+  controllerName: io.cilium/gateway-controller
+  description: Cilium Gateway API implementation (eBPF-native)
+
+---
+# ------------------------------------------------------------------------------
+# Gateway — fastpass-gateway
+#
+# This is the central Gateway that all HTTPRoute resources attach to.
+# Cilium operator creates a LoadBalancer service for this Gateway automatically,
+# which will receive an IP from the cilium-gateway-pool (10.1.71.90-.99).
+#
+# Usage: Applications create HTTPRoute resources that reference this Gateway:
+#
+#   spec:
+#     parentRefs:
+#       - name: fastpass-gateway
+#         namespace: gateway-system
+# ------------------------------------------------------------------------------
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: fastpass-gateway
+  namespace: gateway-system
+  annotations:
+    io.cilium/lb-ipam-ips: "10.1.71.90"
+spec:
+  gatewayClassName: cilium
+  listeners:
+    - name: http
+      protocol: HTTP
+      port: 80
+      allowedRoutes:
+        namespaces:
+          from: All
+    - name: https
+      protocol: HTTPS
+      port: 443
+      allowedRoutes:
+        namespaces:
+          from: All
+      tls:
+        mode: Terminate
+        certificateRefs:
+          - name: argocd-tls
+            namespace: argocd