scale down unused/over-replicated services

- osm-routing (otp, osrm-bicycle, osrm-foot): replicas=0, 0Mi actual usage
- dashy: replicas=0, redundant with homepage
- echo: 5 -> 1 replica
- networking-toolbox: 3 -> 1 replica
- travel-blog: 3 -> 1 replica
- blog: 3 -> 1 replica

Saves ~3.5Gi memory requests.

stacks/blog/main.tf

@@ -30,7 +30,7 @@ resource "kubernetes_deployment" "blog" {
     }
   }
   spec {
-    replicas = 3
+    replicas = 1
     selector {
       match_labels = {
         run = "blog"

stacks/dashy/main.tf

@@ -48,7 +48,8 @@ resource "kubernetes_deployment" "dashy" {
     }
   }
   spec {
-    replicas = 1
+    # Disabled: reduce cluster memory pressure (2026-03-14 OOM incident)
+    replicas = 0
     selector {
       match_labels = {
         app = "dashy"

stacks/echo/main.tf

@@ -30,7 +30,7 @@ resource "kubernetes_deployment" "echo" {
     }
   }
   spec {
-    replicas = 5
+    replicas = 1
     selector {
       match_labels = {
         app = "echo"

stacks/networking-toolbox/main.tf

@@ -30,7 +30,7 @@ resource "kubernetes_deployment" "networking-toolbox" {
     }
   }
   spec {
-    replicas = 3
+    replicas = 1
     selector {
       match_labels = {
         app = "networking-toolbox"

stacks/osm_routing/main.tf

@@ -59,7 +59,8 @@ resource "kubernetes_deployment" "osrm-foot" {
     }
   }
   spec {
-    replicas = 1
+    # Disabled: reduce cluster memory pressure (2026-03-14 OOM incident)
+    replicas = 0
     strategy {
       type = "Recreate"
     }
@@ -139,7 +140,8 @@ resource "kubernetes_deployment" "osrm-bicycle" {
     }
   }
   spec {
-    replicas = 1
+    # Disabled: reduce cluster memory pressure (2026-03-14 OOM incident)
+    replicas = 0
     strategy {
       type = "Recreate"
     }
@@ -219,7 +221,8 @@ resource "kubernetes_deployment" "otp" {
     }
   }
   spec {
-    replicas = 1
+    # Disabled: reduce cluster memory pressure (2026-03-14 OOM incident)
+    replicas = 0
     strategy {
       type = "Recreate"
     }

stacks/travel_blog/main.tf

@@ -30,7 +30,7 @@ resource "kubernetes_deployment" "blog" {
     }
   }
   spec {
-    replicas = 3
+    replicas = 1
     selector {
       match_labels = {
         app = "travel-blog"