feat: add TraefikService weighted routing

apps/nginx-weighted/traefikservice.yaml

@@ -0,0 +1,23 @@
+---
+# TraefikService — weighted load balancer between stable and canary
+# Edit weights to control traffic split:
+#   stable: 90, canary: 10  →  10% to canary (initial test)
+#   stable: 50, canary: 50  →  50% to canary (extended testing)
+#   stable:  0, canary: 100 →  full promote canary to stable
+#   stable: 100, canary:  0 →  emergency rollback
+apiVersion: traefik.io/v1alpha1
+kind: TraefikService
+metadata:
+  name: nginx-weighted
+  namespace: nginx-mcp
+spec:
+  weighted:
+    services:
+      - name: nginx-mcp
+        namespace: nginx-mcp
+        port: 80
+        weight: 90
+      - name: nginx-canary-proxy
+        namespace: nginx-mcp
+        port: 80
+        weight: 10