Track k8s manifest; teach make sync to mirror deployment/

The flights-front deploy repo ships k8s manifests at deployment/k8s/,
a sibling of Aeroflot.Flights.Front/. Previously the sync script only
copied the app source, so any env change landed on the k8s side had
to be hand-edited in the deploy repo and was never reflected back.

- Bring deployment/k8s/flights-ui.yaml into this repo (with the new
  MAP_TILE_URL env pointing at flights.test.aeroflot.ru) so the
  cluster config lives next to the code that reads it.
- sync-to-flights-front.sh resolves the deploy-repo root from the
  target path and mirrors this repo's deployment/ directory there,
  mkdir'ing and copying contents without wiping unrelated files.
- Bump step numbering (1/6..6/6) and the summary now lists the synced
  deployment files in addition to the app files.

deployment/k8s/flights-ui.yaml

@@ -0,0 +1,40 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: $AFL_PRJ_NAME
+spec:
+  selector:
+    matchLabels:
+      name: $AFL_PRJ_NAME
+  template:
+    metadata:
+      labels:
+        name: $AFL_PRJ_NAME
+    spec:
+      nodeSelector:
+        kubernetes.io/os: linux
+      containers:
+      - name: $AFL_PRJ_NAME
+        image: $REGISTRY_SERVER/aeroflot.$K8NAMESPACE.$ENVIRONMENT/$AFL_PRJ_NAME:v$VERSION.$BUILD_NUMBER
+        ports:
+        - containerPort: 8080
+        resources:
+          limits:
+            memory: "256Mi"
+            cpu: "1000m"
+          requests:
+            memory: "64Mi"
+            cpu: "100m"
+        env:
+        - name: NODE_ENV
+          value: production
+        - name: ENVIRONMENT
+          value: $ENVIRONMENT
+        # flights-ui.devwebzavod.ru has no /map/api/** ingress rule, so
+        # point Leaflet at the upstream tile service that the real
+        # Aeroflot ingress serves (flights.test.aeroflot.ru terminates
+        # /map/api/** correctly). Override per-cluster if a different
+        # tile source is required.
+        - name: MAP_TILE_URL
+          value: https://flights.test.aeroflot.ru/map/api/tile/{z}/{x}/{y}.jpeg
+$IMAGE_PULL_SECRETS