mapper/uralkal: own env with in-cluster addresses

The overlay inherited SaaS prod hosts from base (api.sarex.io, lk.sarex.io),
which fail TLS verification from the closed contour. Point documentations,
flows, django and notes at their uralkal services; REDIS_USE and TIMEOUT
unchanged.

apps/mapper/uralkal/backend.yaml

@@ -13,3 +13,28 @@ spec:
             requests:
               cpu: null
               memory: null
+
+        envs:
+          - name: DOCUMENTATION_HOST
+            value:
+              _default: "http://backend-api-svc.documentations.svc.cluster.local/api/v1"
+
+          - name: FLOW_HOST
+            value:
+              _default: "http://backend-svc.flows.svc.cluster.local/api/v1"
+
+          - name: DJANGO_HOST
+            value:
+              _default: "http://backend-svc.django.svc.cluster.local/api"
+
+          - name: NOTE_HOST
+            value:
+              _default: "http://backend-service.notes.svc.cluster.local:8000/api/v1"
+
+          - name: REDIS_USE
+            value:
+              _default: "0"
+
+          - name: TIMEOUT
+            value:
+              _default: "120"